JavaScript - 如何逐字符显示文本

Question

我正在尝试使用 JavaScript 逐个字符地显示从数组中获取的文本。我已经设法用数组的一部分做到了。我找不到换行并显示其余部分的方法。

var container = document.getElementById("container");

var notes = [
{scenario: 1, intro: "This is the introduction.", que: "What is the weight of ....?"},
{scenario: 2, intro: "This is the second scen.", que: "What is the second law of ...?"},
{scenario: 3, intro: "This is the third thing.", que: "What is the third law of ...?"},
];


function splTxt(txt) {
    // Split string into characters                                                                                                                                           
    t = txt.split('');
return t
}

function terminal(cl, i) {
// Create a div element and display message                                                                                                                               
var div = document.createElement('div');
div.className = cl;
container.appendChild(div);

// Take the first element of the array                                                                                                                                    
// and extract the intro string                                                                                                                                           
var txt = splTxt(notes[0].intro);
var i = 0;

// Display text, character by character                                                                                                                                   
var display = setInterval(function() {
    div.textContent += txt[i];
    if (i == (txt.length-1)) {
        clearInterval(display);
    }
    i += 1
}, 100);

}

terminal('blueTh', 0);

显示notes[0].intro之后, 我希望它换行显示 notes[0].que .

我试过

var txt = splTxt(notes[0].intro + '<br />' +  notes[0].que);

但很明显，它只是显示<br />并在同一行打印两条消息。

Answer 1

你有两个选择:

• 插入 <br />并告诉浏览器将其解析为 HTML。

  您可以使用 innerHTML 来做到这一点属性而不是 textContent .

  这将允许您使用 HTML 内容，例如 <br /> , 但你必须逃脱 & , < , >当它们应该是纯文本时。如果您不信任文本，请不要这样做。

  var container = document.getElementById("container");
  var notes = [
    {scenario: 1, intro: "This is the introduction.", que: "What is the weight of ....?"},
    {scenario: 2, intro: "This is the second scen.", que: "What is the second law of ...?"},
    {scenario: 3, intro: "This is the third thing.", que: "What is the third law of ...?"}
  ];
  function terminal(cl, i) {
    var div = document.createElement('div');
    div.className = cl;
    container.appendChild(div);
    var txt = [notes[0].intro, notes[0].que].join('\n').split('');
    var i = 0;
    (function display() {
      if(i < txt.length) {
        div.innerHTML += txt[i].replace('\n', '<br />');
        ++i;
        setTimeout(display, 100);
      }
    })();
  }
  terminal('blueTh', 0);

  <div id="container"></div>

• 插入换行符并告诉浏览器正确显示它。

  在 HTML 中，空白字符默认折叠。您可以通过设置 white-space 来更改此行为CSS 属性为 pre , pre-wrap或 pre-line .例如，white-space: pre保留所有空格并且不换行。

  var container = document.getElementById("container");
  var notes = [
    {scenario: 1, intro: "This is the introduction.", que: "What is the weight of ....?"},
    {scenario: 2, intro: "This is the second scen.", que: "What is the second law of ...?"},
    {scenario: 3, intro: "This is the third thing.", que: "What is the third law of ...?"}
  ];
  function terminal(cl, i) {
    var div = document.createElement('div');
    div.className = cl;
    container.appendChild(div);
    var txt = [notes[0].intro, notes[0].que].join('\n').split('');
    var i = 0;
    (function display() {
      if(i < txt.length) {
        div.textContent += txt[i];
        ++i;
        setTimeout(display, 100);
      }
    })();
  }
  terminal('blueTh', 0);

  #container {
    white-space: pre-line;
  }

  <div id="container"></div>