javascript - JS Canvas 运动动画循环-6ren

javascript - JS Canvas 运动动画循环

转载作者：塔克拉玛干更新时间：2023-11-02 21:23:26

我有一个对象渲染到 Canvas 上。我试图让对象在一个循环中沿着设定的路径移动。这是我所拥有的:

// Canvas Element
var canvas = null;

// Canvas Draw
var ctx = null;

// Static Globals
var tileSize = 16,
    mapW = 10,
    mapH = 10;

// Instances of entities
var entities = [
  // A single entity that starts at tile 28, and uses the setPath() function
  {
    id: 0,
    tile: 28,
    xy: tileToCoords(28),
    width: 16,
    height: 24,
    speedX: 0,
    speedY: 0,
    logic: {
      func: 'setPath',
      // These are the parameters that go into the setPath() function
      data: [0, ['down', 'up', 'left', 'right'], tileToCoords(28), 0]
    },
    dir: {up:false, down:false, left:false, right:false}
  }
];

// Array for tile data
var map = [];

window.onload = function(){

  // Populate the map array with a blank map and 4 walls
  testMap();
  
  canvas = document.getElementById('save');
  ctx = canvas.getContext("2d");

  // Add all the entities to the map array and start their behavior
  for(var i = 0; i < entities.length; ++i){

    map[entities[i].tile].render.object = entities[i].id;

    if(entities[i].logic){        
      window[entities[i].logic.func].apply(null, entities[i].logic.data);
    }
  }

  drawGame(map);
  window.requestAnimationFrame(function(){
    mainLoop();
  });
};

function drawGame(map){
  ctx.clearRect(0, 0, canvas.width, canvas.height);

  // We save all the entity data for later so the background colors don't get rendered on top
  var tileObjData = [];

  for(var y = 0; y < mapH; ++y){
    for(var x = 0; x < mapW; ++x){

      var currentPos = ((y*mapW)+x);

      ctx.fillStyle = map[currentPos].render.base;
      ctx.fillRect(x*tileSize, y*tileSize, tileSize, tileSize);

      var thisObj = map[currentPos].render.object;

      if(thisObj !== false){

        thisObj = entities[thisObj];
        var originX = thisObj.xy.x;
        var originY = thisObj.xy.y;
        tileObjData.push(
          {
            id: thisObj.id,
            originX: originX, 
            originY: originY, 
            width: thisObj.width, 
            height: thisObj.height,
          }
        );
      }
    }
  }
  
  // Draw all the entities after the background tiles are drawn
  for(var i = 0; i < tileObjData.length; ++i){
    drawEntity(tileObjData[i].id, tileObjData[i].originX, tileObjData[i].originY, tileObjData[i].width, tileObjData[i].height);
  }
}

// Draws the entity data
function drawEntity(id, posX, posY, sizeX, sizeY){

  var offX = posX + entities[id].speedX;
  var offY = posY + entities[id].speedY;
  
  ctx.fillStyle = '#00F';
  ctx.fillRect(offX, offY + sizeX - sizeY, sizeX, sizeY);

  entities[id].xy.x = offX;
  entities[id].xy.y = offY;
}

// Redraws the canvas with the browser framerate
function mainLoop(){
  drawGame(map);

  for(var i = 0; i < entities.length; ++i){
    animateMove(i, entities[i].dir.up, entities[i].dir.down, entities[i].dir.left, entities[i].dir.right);
  }

  window.requestAnimationFrame(function(){
    mainLoop();
  });
}

// Sets the speed, direction, and collision detection of an entity
function animateMove(id, up, down, left, right){

  var prevTile = entities[id].tile;

  if(up){

    var topLeft = {x: entities[id].xy.x, y: entities[id].xy.y};
    var topRight = {x: entities[id].xy.x + entities[id].width - 1, y: entities[id].xy.y};

    if(!map[coordsToTile(topLeft.x, topLeft.y - 1)].state.passable || !map[coordsToTile(topRight.x, topRight.y - 1)].state.passable){
      entities[id].speedY = 0;
    }
    else{
      entities[id].speedY = -1;
    }
  }
  else if(down){

    var bottomLeft = {x: entities[id].xy.x, y: entities[id].xy.y + entities[id].width - 1};
    var bottomRight = {x: entities[id].xy.x + entities[id].width - 1, y: entities[id].xy.y + entities[id].width - 1};

    if(!map[coordsToTile(bottomLeft.x, bottomLeft.y + 1)].state.passable || !map[coordsToTile(bottomRight.x, bottomRight.y + 1)].state.passable){
      entities[id].speedY = 0;
    }
    else{
      entities[id].speedY = 1;
    }
  }
  else{
    entities[id].speedY = 0;
  }

  if(left){

    var bottomLeft = {x: entities[id].xy.x, y: entities[id].xy.y + entities[id].width - 1};
    var topLeft = {x: entities[id].xy.x, y: entities[id].xy.y};

    if(!map[coordsToTile(bottomLeft.x - 1, bottomLeft.y)].state.passable || !map[coordsToTile(topLeft.x - 1, topLeft.y)].state.passable){
      entities[id].speedX = 0;
    }
    else{
      entities[id].speedX = -1;
    }
  }
  else if(right){

    var bottomRight = {x: entities[id].xy.x + entities[id].width - 1, y: entities[id].xy.y + entities[id].width - 1};
    var topRight = {x: entities[id].xy.x + entities[id].width - 1, y: entities[id].xy.y};

    if(!map[coordsToTile(bottomRight.x + 1, bottomRight.y)].state.passable || !map[coordsToTile(topRight.x + 1, topRight.y)].state.passable){
      entities[id].speedX = 0;
    }
    else{
      entities[id].speedX = 1;
    }
  }
  else{
    entities[id].speedX = 0;
  }

  entities[id].tile = coordsToTile(entities[id].xy.x + (entities[id].width / 2), entities[id].xy.y + (tileSize / 2));
  map[entities[id].tile].render.object = id;

  if(prevTile !== entities[id].tile){
    map[prevTile].render.object = false;
  }
}

//////////////////////////////////////
// THIS IS WHERE I'M HAVING TROUBLE //
//////////////////////////////////////
// A function that can be used by an entity to move along a set path
// id = The id of the entity using this function
// path = An array of strings that determine the direction of movement for a single tile
// originPoint = Coordinates of the previous tile this entity was at. This variable seems to be where problems happen with this logic. It should get reset for every tile length moved, but it only gets reset once currently.
// step = The current index of the path array 
function setPath(id, path, originPoint, step){

  // Determine if the entity has travelled one tile from the origin
  var destX = Math.abs(entities[id].xy.x - originPoint.x);
  var destY = Math.abs(entities[id].xy.y - originPoint.y);

  if(destX >= tileSize || destY >= tileSize){
    // Go to the next step in the path array
    step = step + 1;
    if(step >= path.length){
      step = 0;
    }
    // Reset the origin to the current tile coordinates
    originPoint = entities[id].xy;
  }
  
  // Set the direction based on the current index of the path array
  switch(path[step]) {

    case 'up':
      entities[id].dir.up = true;
      entities[id].dir.down = false;
      entities[id].dir.left = false;
      entities[id].dir.right = false;
      break;

    case 'down':
      entities[id].dir.up = false;
      entities[id].dir.down = true;
      entities[id].dir.left = false;
      entities[id].dir.right = false;
      break;

    case 'left':
      entities[id].dir.up = false;
      entities[id].dir.down = false;
      entities[id].dir.left = true;
      entities[id].dir.right = false;
      break;

    case 'right':
      entities[id].dir.up = false;
      entities[id].dir.down = false;
      entities[id].dir.left = false;
      entities[id].dir.right = true;
      break;
  };

  window.requestAnimationFrame(function(){
    setPath(id, path, originPoint, step);
  });
}

// Take a tile index and return x,y coordinates
function tileToCoords(tile){

  var yIndex = Math.floor(tile / mapW);
  var xIndex = tile - (yIndex * mapW);

  var y = yIndex * tileSize;
  var x = xIndex * tileSize;
  return {x:x, y:y};
}

// Take x,y coordinates and return a tile index
function coordsToTile(x, y){

  var tile = ((Math.floor(y / tileSize)) * mapW) + (Math.floor(x / tileSize));
  return tile;
}

// Generate a map array with a blank map and 4 walls
function testMap(){
  for(var i = 0; i < (mapH * mapW); ++i){

    // Edges

    if (
      // top
      i < mapW || 
      // left
      (i % mapW) == 0 || 
      // right
      ((i + 1) % mapW) == 0 || 
      // bottom
      i > ((mapW * mapH) - mapW)
    ) {

      map.push(
        {
          id: i,
          render: {
            base: '#D35',
            object: false,
            sprite: false
          },
          state: {
            passable: false
          }
        },
      );

    }
    else{

      // Grass

      map.push(
        {
          id: i,
          render: {
            base: '#0C3',
            object: false,
            sprite: false
          },
          state: {
            passable: true
          }
        },
      );

    }
  }
}

<!DOCTYPE html>
<html>
<head>

  <style>

    body{
      background-color: #000;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-size: 18px;
      padding: 0;
      margin: 0;
    }

    main{
      width: 100%;
      max-width: 800px;
      margin: 10px auto;
      display: flex;
      align-items: flex-start;
      justify-content: center;
      flex-wrap: wrap;
    }

    .game{
      width: 1000px;
      height: 1000px;
      position: relative;
    }

    canvas{
      image-rendering: -moz-crisp-edges;
      image-rendering: -webkit-crisp-edges;
      image-rendering: pixelated;
      image-rendering: crisp-edges;
    }

    .game canvas{
      position: absolute;
      top: 0;
      left: 0;
      width: 800px;
      height: 800px;
    }

  </style>
  
</head>
<body>
  
  <main>
    <div class="game">
      <canvas id="save" width="200" height="200" style="z-index: 1;"></canvas>
    </div>
  </main>

</body>
</html>

问题出在 setPath() 函数上，更具体地说，我认为它出在 originPoint 变量上。这个想法是 setPath() 将对象每个 path 字符串移动一个瓦片，而 originPoint 应该是最后访问的瓦片的坐标(所以只有当对象坐标距 originPoint 一个瓦片长度时，它才会更新)。现在它只会第一次更新然后停止。希望有人能指出我在这里做错了什么。

最佳答案

你改变路径方向的条件我把它改成每个方向都有条件，比如:

if ((entities[id].dir.left  && entities[id].xy.x <= tileSize) ||    
  (entities[id].dir.right && entities[id].xy.x >= tileSize*8) || 
  (entities[id].dir.up    && entities[id].xy.y <= tileSize) ||
  (entities[id].dir.down  && entities[id].xy.y >= tileSize*8)) {

originPoint 只是您应该做的引用:

originPoint = JSON.parse(JSON.stringify(entities[id].xy));

查看下面的工作代码

// Canvas Element
var canvas = null;

// Canvas Draw
var ctx = null;

// Static Globals
var tileSize = 16,
    mapW = 10,
    mapH = 10;

// Instances of entities
var entities = [
  // A single entity that starts at tile 28, and uses the setPath() function
  {
    id: 0,
    tile: 28,
    xy: tileToCoords(28),
    width: 16,
    height: 24,
    speedX: 0,
    speedY: 0,
    logic: {
      func: 'setPath',
      // These are the parameters that go into the setPath() function
      data: [0, ['down', 'left', 'down', 'left', 'up', 'left', 'left', 'right', 'up', 'right', 'down','right', "up"], tileToCoords(28), 0]
    },
    dir: {up:false, down:false, left:false, right:false}
  }
];

// Array for tile data
var map = [];

window.onload = function(){

  // Populate the map array with a blank map and 4 walls
  testMap();
  
  canvas = document.getElementById('save');
  ctx = canvas.getContext("2d");

  // Add all the entities to the map array and start their behavior
  for(var i = 0; i < entities.length; ++i){

    map[entities[i].tile].render.object = entities[i].id;

    if(entities[i].logic){        
      window[entities[i].logic.func].apply(null, entities[i].logic.data);
    }
  }

  drawGame(map);
  window.requestAnimationFrame(function(){
    mainLoop();
  });
};

function drawGame(map){
  ctx.clearRect(0, 0, canvas.width, canvas.height);

  // We save all the entity data for later so the background colors don't get rendered on top
  var tileObjData = [];

  for(var y = 0; y < mapH; ++y){
    for(var x = 0; x < mapW; ++x){

      var currentPos = ((y*mapW)+x);

      ctx.fillStyle = map[currentPos].render.base;
      ctx.fillRect(x*tileSize, y*tileSize, tileSize, tileSize);

      var thisObj = map[currentPos].render.object;

      if(thisObj !== false){

        thisObj = entities[thisObj];
        var originX = thisObj.xy.x;
        var originY = thisObj.xy.y;
        tileObjData.push(
          {
            id: thisObj.id,
            originX: originX, 
            originY: originY, 
            width: thisObj.width, 
            height: thisObj.height,
          }
        );
      }
    }
  }
  
  // Draw all the entities after the background tiles are drawn
  for(var i = 0; i < tileObjData.length; ++i){
    drawEntity(tileObjData[i].id, tileObjData[i].originX, tileObjData[i].originY, tileObjData[i].width, tileObjData[i].height);
  }
}

// Draws the entity data
function drawEntity(id, posX, posY, sizeX, sizeY){

  var offX = posX + entities[id].speedX;
  var offY = posY + entities[id].speedY;
  
  ctx.fillStyle = '#00F';
  ctx.fillRect(offX, offY + sizeX - sizeY, sizeX, sizeY);

  entities[id].xy.x = offX;
  entities[id].xy.y = offY;
}

// Redraws the canvas with the browser framerate
function mainLoop(){
  drawGame(map);

  for(var i = 0; i < entities.length; ++i){
    animateMove(i, entities[i].dir.up, entities[i].dir.down, entities[i].dir.left, entities[i].dir.right);
  }

  window.requestAnimationFrame(function(){
    mainLoop();
  });
}

// Sets the speed, direction, and collision detection of an entity
function animateMove(id, up, down, left, right){

  var prevTile = entities[id].tile;

  if(up){

    var topLeft = {x: entities[id].xy.x, y: entities[id].xy.y};
    var topRight = {x: entities[id].xy.x + entities[id].width - 1, y: entities[id].xy.y};

    if(!map[coordsToTile(topLeft.x, topLeft.y - 1)].state.passable || !map[coordsToTile(topRight.x, topRight.y - 1)].state.passable){
      entities[id].speedY = 0;
    }
    else{
      entities[id].speedY = -1;
    }
  }
  else if(down){

    var bottomLeft = {x: entities[id].xy.x, y: entities[id].xy.y + entities[id].width - 1};
    var bottomRight = {x: entities[id].xy.x + entities[id].width - 1, y: entities[id].xy.y + entities[id].width - 1};

    if(!map[coordsToTile(bottomLeft.x, bottomLeft.y + 1)].state.passable || !map[coordsToTile(bottomRight.x, bottomRight.y + 1)].state.passable){
      entities[id].speedY = 0;
    }
    else{
      entities[id].speedY = 1;
    }
  }
  else{
    entities[id].speedY = 0;
  }

  if(left){

    var bottomLeft = {x: entities[id].xy.x, y: entities[id].xy.y + entities[id].width - 1};
    var topLeft = {x: entities[id].xy.x, y: entities[id].xy.y};

    if(!map[coordsToTile(bottomLeft.x - 1, bottomLeft.y)].state.passable || !map[coordsToTile(topLeft.x - 1, topLeft.y)].state.passable){
      entities[id].speedX = 0;
    }
    else{
      entities[id].speedX = -1;
    }
  }
  else if(right){

    var bottomRight = {x: entities[id].xy.x + entities[id].width - 1, y: entities[id].xy.y + entities[id].width - 1};
    var topRight = {x: entities[id].xy.x + entities[id].width - 1, y: entities[id].xy.y};

    if(!map[coordsToTile(bottomRight.x + 1, bottomRight.y)].state.passable || !map[coordsToTile(topRight.x + 1, topRight.y)].state.passable){
      entities[id].speedX = 0;
    }
    else{
      entities[id].speedX = 1;
    }
  }
  else{
    entities[id].speedX = 0;
  }

  entities[id].tile = coordsToTile(entities[id].xy.x + (entities[id].width / 2), entities[id].xy.y + (tileSize / 2));
  map[entities[id].tile].render.object = id;

  if(prevTile !== entities[id].tile){
    map[prevTile].render.object = false;
  }
}

//////////////////////////////////////
// THIS IS WHERE I'M HAVING TROUBLE //
//////////////////////////////////////
// A function that can be used by an entity to move along a set path
// id = The id of the entity using this function
// path = An array of strings that determine the direction of movement for a single tile
// originPoint = Coordinates of the previous tile this entity was at. This variable seems to be where problems happen with this logic. It should get reset for every tile length moved, but it only gets reset once currently.
// step = The current index of the path array 

function setPath(id, path, originPoint, step){
  if ((entities[id].dir.left  && entities[id].xy.x <= originPoint.x - tileSize) ||    
      (entities[id].dir.right && entities[id].xy.x >= originPoint.x + tileSize) || 
      (entities[id].dir.up    && entities[id].xy.y <= originPoint.y - tileSize) ||
      (entities[id].dir.down  && entities[id].xy.y >= originPoint.y + tileSize)) {
    // Go to the next step in the path array
    step = step + 1;
    if(step >= path.length){
      step = 0;
    }
    // Reset the origin to the current tile coordinates
    originPoint = JSON.parse(JSON.stringify(entities[id].xy));
  }
  
  // Set the direction based on the current index of the path array
  switch(path[step]) {

    case 'up':
      entities[id].dir.up = true;
      entities[id].dir.down = false;
      entities[id].dir.left = false
      entities[id].dir.right = false;
      break;

    case 'down':
      entities[id].dir.up = false;
      entities[id].dir.down = true;
      entities[id].dir.left = false;
      entities[id].dir.right = false;
      break;

    case 'left':
      entities[id].dir.up = false;
      entities[id].dir.down = false;
      entities[id].dir.left = true;
      entities[id].dir.right = false;
      break;

    case 'right':
      entities[id].dir.up = false;
      entities[id].dir.down = false;
      entities[id].dir.left = false;
      entities[id].dir.right = true;
      break;
  };

  window.requestAnimationFrame(function(){
    setPath(id, path, originPoint, step);
  });
}

// Take a tile index and return x,y coordinates
function tileToCoords(tile){

  var yIndex = Math.floor(tile / mapW);
  var xIndex = tile - (yIndex * mapW);

  var y = yIndex * tileSize;
  var x = xIndex * tileSize;
  return {x:x, y:y};
}

// Take x,y coordinates and return a tile index
function coordsToTile(x, y){

  var tile = ((Math.floor(y / tileSize)) * mapW) + (Math.floor(x / tileSize));
  return tile;
}

// Generate a map array with a blank map and 4 walls
function testMap(){
  for(var i = 0; i < (mapH * mapW); ++i){

    // Edges

    if (
      // top
      i < mapW || 
      // left
      (i % mapW) == 0 || 
      // right
      ((i + 1) % mapW) == 0 || 
      // bottom
      i > ((mapW * mapH) - mapW)
    ) {

      map.push(
        {
          id: i,
          render: {
            base: '#D35',
            object: false,
            sprite: false
          },
          state: {
            passable: false
          }
        },
      );

    }
    else{

      // Grass

      map.push(
        {
          id: i,
          render: {
            base: '#0C3',
            object: false,
            sprite: false
          },
          state: {
            passable: true
          }
        },
      );

    }
  }
}

<!DOCTYPE html>
<html>
<head>

  <style>

    body{
      background-color: #000;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-size: 18px;
      padding: 0;
      margin: 0;
    }

    main{
      width: 100%;
      max-width: 800px;
      margin: 10px auto;
      display: flex;
      align-items: flex-start;
      justify-content: center;
      flex-wrap: wrap;
    }

    .game{
      width: 1000px;
      height: 1000px;
      position: relative;
    }

    canvas{
      image-rendering: -moz-crisp-edges;
      image-rendering: -webkit-crisp-edges;
      image-rendering: pixelated;
      image-rendering: crisp-edges;
    }

    .game canvas{
      position: absolute;
      top: 0;
      left: 0;
      width: 800px;
      height: 800px;
    }

  </style>
  
</head>
<body>
  
  <main>
    <div class="game">
      <canvas id="save" width="200" height="200" style="z-index: 1;"></canvas>
    </div>
  </main>

</body>
</html>

关于javascript - JS Canvas 运动动画循环，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57734806/

文章推荐： ios - UITableView 滚动性能

文章推荐： iOS CorePlot x 轴 DateTime 间隔成比例

文章推荐： javascript - 函数是否作为 props 在此代码中传递？

javascript - 执行存在于输入值字段中的 javascript - JavaScript
我有一个 html 格式的表单: 我需要得到 JavaScript在value input 字段执行，但只能通过表单的 submit .原因是页面是一个模板所以我不控制它(不能有
javascript - JavaScript 代码片段正在破坏其他 JavaScript
我管理的论坛是托管软件，因此我无法访问源代码，我只能向页面添加 JavaScript 来实现我需要完成的任务。我正在尝试用超链接替换所有页面上某些文本关键字的第一个实例。我还根据国家/地区代码对这些
javascript - JavaScript 如何使新页面包含更多 JavaScript？
我正在使用 JS 打开新页面并将 HTML 代码写入其中，但是当我尝试使用 document.write() 在新页面中编写 JS 时功能不起作用。显然，一旦看到，主 JS 就会关闭。用于即将打开的
javascript - Javascript 引擎如何在浏览器中执行 Javascript？
提问不是为了解决问题，提问是为了更好地理解系统专家!我知道每当你将 javascript 代码输入 javascript 引擎时，它会立即由 javascript 引擎执行。由于没有看过Engi
javascript - 如何将 JavaScript 变量从一个 JavaScript 文件传递到另一个 JavaScript 文件？
我在一个文件夹中有两个 javascript 文件。我想将一个变量的 javascript 文件传递到另一个。我应该使用什么程序？最佳答案 window.postMessage用于跨文档消息。使
javascript - javascript 中的 javascript 输入问题
我有一个练习，我需要输入两个输入并检查它们是否都等于一个。如果是 console.log 正则 console.log false 我试过这样的事情: function isPositive(fir
javascript - 在加载其他 javascript 库的页面上嵌入 Javascript？
我正在做一个Web应用程序，计划允许其他网站(客户端)在其页面上嵌入以下javascript: 我的网络应用程序位于 http://example.org 。我不能假设客户端网站的页面有 JQue
javascript - 从 Javascript 内部调用 Javascript
目前我正在使用三个外部 JS 文件。我喜欢将所有三个 JS 文件合而为一。尽一切可能。我创建 aio.js 并在 aio.js 中 src="https://code.jquery.com/
javascript - AngularJS/javascript javascript 对象的特殊排序顺序
我有例如像这样的数组: var myArray = []; var item1 = { start: '08:00', end: '09:30' } var item2 = {
javascript - 在 Javascript 内部执行 Javascript？
所以我正在制作一个 Chrome 扩展，它使用我制作的一些 TamperMonkey 脚本。我想要一个“主”javascript 文件，您可以在其中包含并执行其他脚本。我很擅长使用以下行将其他 jav
javascript - 如何将变量从 javascript 移动到 javascript？
我有 A、B html 和 A、B javascript 文件。并且，如何将 A JavaScript 中使用的全局变量直接移动到 B JavaScript 中？示例 JavaScript) va
javascript - 从 javascript 调用 javascript
我需要将以下整个代码放入名为 activate.js 的 JavaScript 中。你能告诉我怎么做吗？ var int = new int({ seconds: 30, mark
javascript - 将变量值从一个 JavaScript 传递到另一个 JavaScript
我已经为我的 .net Web 应用程序创建了母版页 EXAMPLE1.Master。他们的 I 将值存储在 JavaScript 变量中。我想在另一个 JS 文件中检索该变量。示例1.大师:-
javascript - 有没有开源库可以在浏览器中使用 Javascript 来整理 Javascript？
是否有任何库可以用来转换这样的代码: function () { var a = 1; } 像这样的代码: function () { var a = 1; } 在我的浏览器中。因为我在 Gi
javascript - javascript 中的参数列表后缺少语法 javascript 错误 )
我收到语法缺失 ) 错误 $(document).ready(function changeText() { var p = document.getElementById('bidp
javascript - 第一个 JavaScript 完成后启动第二个 JavaScript
我正在制作进度条。它有一个标签。我想调整某个脚本完成的标签。在找到可能的解决方案的一些答案后，我想出了以下脚本。第一个启动并按预期工作。然而，第二个却没有。它出什么问题了？代码如下: HTML:
javascript - 为什么外部 javascript 库会阻止我页面上的 javascript？
这里有一个很简单的问题，我简单的头脑无法回答:为什么我在外部库中加载时，下面的匿名和onload函数没有运行？我错过了一些非常非常基本的东西。 Library.js 只有一行:console.log(
javascript - 如何区分代码内 javascript 和客户端 javascript
我知道 javascript 是一种客户端语言，但如果实际代码中嵌入的 javascript 代码以某种方式与在控制台上运行的代码不同，我会尝试找到答案。让我用一个例子来解释它: 我想创建一个像 Mi
javascript - 将 Javascript 内联到不显眼的 JavaScript？
我如何将这个内联 javascript 更改为 Unobtrusive JavaScript？谢谢! 感谢您的回答，但它不起作用。我的代码是: PHP js文件 document.getElem
javascript - 如何将 JavaScript 对象导出为 JavaScript？
我正在寻找将简单的 JavaScript 对象“转储”到动态生成的 JavaScript 源代码中的最优雅的方法。目的:假设我们有 node.js 服务器生成 HTML。我们在服务器端有一个对象x。

塔克拉玛干

个人简介

我是一名优秀的程序员,十分优秀！

作者热门文章

滴滴打车优惠券免费领取

全站热门文章

首页

博学

6Ren·AI

商城

javascript - JS Canvas 运动动画循环