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javascript - CSS 转换极度滞后的视网膜显示

转载 作者:行者123 更新时间:2023-11-30 15:57:36 24 4
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我正在制作一个具有视差滚动功能的网站,它在 Retina 显示器上非常滞后,但在 macbook 分辨率越低的情况下越流畅。我不知道为什么,几周来我一直在寻找答案。我还使用了我在 css 下面添加的 javascript。这是 css/javascript:

.background {
background-size: cover;
background-repeat: no-repeat;
background-position: center center;
overflow: auto;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-weight: 100;
will-change: transform;
-webkit-backface-visibility: hidden;
backface-visibility: hidden;
height: 130vh;
position: fixed;
text-shadow: black 2px 2px 2px;
width: 100%;
-webkit-transition: all 1.2s cubic-bezier(0.22, 0.44, 0, 1);
transition: all 1.2s cubic-bezier(0.22, 0.44, 0, 1);
color: #fff;
}

.background:first-child {
background-color: rgba(156, 146, 137, 1);
-webkit-transform: translateY(-15vh);
}
.background:first-child .content-wrapper {
-webkit-transform: translateY(15vh);
}
.background:nth-child(2) {
background-image: url(2.jpg);
}
.background:nth-child(3) {
background-image: url(3.jpg);
}
.background:nth-child(4) {
background-image: url(1.jpg);
}
.background:nth-child(5) {
/*NEW TITLE HERE*/
background-image: url(3.jpg);
}
/* Set stacking context of slides */
.background:nth-child(1) {
z-index: 5;
}
.background:nth-child(2) {
z-index: 4;
}
.background:nth-child(3) {
z-index: 3;
}
.background:nth-child(4) {
z-index: 2;
}
.background:nth-child(5) {
z-index: 1;
}
.background:nth-child(n+2):before {
content: "";
position: absolute;
width: 100%;
height: 100%;

top: 0;
left: 0;
right: 0;
bottom: 0;

background: -moz-linear-gradient(left, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.5) 20%, rgba(0,0,0,0.5) 50%, rgba(0,0,0,0.5) 80%, rgba(0,0,0,0.1) 100%);
background: -webkit-linear-gradient(left, rgba(0,0,0,0.1) 0%,rgba(0,0,0,0.5) 20%,rgba(0,0,0,0.5) 50%,rgba(0,0,0,0.5) 80%,rgba(0,0,0,0.1) 100%);
background: linear-gradient(to right, rgba(0,0,0,0.1) 0%,rgba(0,0,0,0.5) 20%,rgba(0,0,0,0.5) 50%,rgba(0,0,0,0.5) 80%,rgba(0,0,0,0.1) 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1a000000', endColorstr='#1a000000',GradientType=1 );
}
.content-wrapper {
height: 100vh;
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-pack: center;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
text-align: center;
-webkit-flex-flow: column nowrap;
-ms-flex-flow: column nowrap;
flex-flow: column nowrap;
color: #fff;
will-change: transform;
-webkit-backface-visibility: hidden;
backface-visibility: hidden;
-webkit-transform: translateY(40vh);
-webkit-transition: all 1.7s cubic-bezier(0.22, 0.44, 0, 1);
transition: all 1.7s cubic-bezier(0.22, 0.44, 0, 1);
}
iframe {
width: 33vw;
height: 66vh;

float: right;
}
p {
word-wrap: break-word;
}
.image-style {
width:10vw;
height:7vh;
vertical-align: middle;
}

.background.up-scroll {
-webkit-transform: translate3d(0, -15vh, 0);
}
.background.up-scroll .content-wrapper {
-webkit-transform: translateY(15vh);
}
.background.up-scroll + .background {
-webkit-transform: translate3d(0, 30vh, 0);
}
.background.up-scroll + .background .content-wrapper {
-webkit-transform: translateY(30vh);
}
.background.down-scroll {
-webkit-transform: translate3d(0, -130vh, 0);
}
.background.down-scroll .content-wrapper {
-webkit-transform: translateY(40vh);
}
.background.down-scroll + .background:not(.down-scroll) {
-webkit-transform: translate3d(0, -15vh, 0);
}
.background.down-scroll + .background:not(.down-scroll) .content-wrapper {
-webkit-transform: translateY(15vh);
}
h1{
font-family: trench;
font-size: 3vh;
font-weight: 900;
}
.header {
/*font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;*/
font-weight: 200;
line-height: 160%;
font-size: 2vh;
}
.content-title {
font-size: 10vh;
line-height: 1.4;
}
.map-title-background {
/*background-color: #1477C5;*/
background-color: #4D4D4F;
/*background-size: 100vw 100vh;*/
box-shadow: 0px 10px 5px #888888;
position: absolute;
top: 0px;
left: 0px;
right: 0px;
margin: 0px;
padding: 0px;
}
.map-title {
font-weight: 300;
font-size: 8vh;
}
.project-title {
font-size: 10vh;
line-height: 1.4;
font-family: trench;
}
.background-fade {
height: 130vh;
width: 100vw;
}
.skills-programming {
/*margin-top: 10vh;*/
}
.body-wrapper {
-webkit-box-pack: center;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
text-align: center;
margin: auto;
position: fixed;
top: 0;
width: 50%;
left: 50%;
transform: translateX(-50%);
}

function parallaxScroll(evt) {
console.log("what about this")
if (isFirefox) {
//Set delta for Firefox
delta = evt.detail * (-120);
} else if (isIe) {
//Set delta for IE
delta = -evt.deltaY;
} else {
//Set delta for all other browsers
delta = evt.wheelDelta;
}

if (ticking != true){
if (delta <= -scrollSensitivitySetting) {
//Down scroll
ticking = true;
if (currentSlideNumber !== (totalSlideNumber - 1)) {
currentSlideNumber++;
nextItem();
}
slideDurationTimeout(slideDurationSetting);
}
if (delta >= scrollSensitivitySetting) {
//Up scroll
ticking = true;
if (currentSlideNumber !== 0) {
currentSlideNumber--;
previousItem();
}
slideDurationTimeout(slideDurationSetting);
}
}
}

function touchScroll(ts, te) {
delta = te - ts;
if (ticking != true) {
if (delta <= -scrollSensitivitySetting) {
//Down scroll
ticking = true;
if (currentSlideNumber !== totalSlideNumber - 1) {
currentSlideNumber++;
nextItem();
}
slideDurationTimeout(slideDurationSetting);
}
if (delta >= scrollSensitivitySetting) {
//Up scroll
ticking = true;
if (currentSlideNumber !== 0) {
currentSlideNumber--;
}
previousItem();
slideDurationTimeout(slideDurationSetting);
}
}
}

// ------------- SET TIMEOUT TO TEMPORARILY "LOCK" SLIDES ------------- //
function slideDurationTimeout(slideDuration) {
setTimeout(setTicking, slideDuration);
}

function setTicking() {
ticking = false;
}

var mousewheelEvent = isFirefox ? "DOMMouseScroll" : "wheel";
var ts;

// ------------- ADD EVENT LISTENER ------------- //
$(document).ready(function () {
console.log("called once")
totalSlideNumber = $("section").length;
window.addEventListener(mousewheelEvent, _.throttle(parallaxScroll, 60), false);

window.addEventListener("touchstart", function(e) {
ts = e.touches[0].clientY;
}, false);
window.addEventListener("touchend", function(e) {
var te = e.changedTouches[0].clientY;
touchScroll(ts, te);
}, false);
});

// ------------- SLIDE MOTION ------------- //
function nextItem() {
var $previousSlide = $("section").eq(currentSlideNumber - 1);
$previousSlide.removeClass("up-scroll").addClass("down-scroll");
}

function previousItem() {
var $currentSlide = $("section").eq(currentSlideNumber);
$currentSlide.removeClass("down-scroll").addClass("up-scroll");
}

最佳答案

在查看您的代码后,我有一些建议。

  • 删除 will-change 属性。虽然它应该有助于转换,但过度使用会而且经常会占用太多资源并降低页面速度。 Check out the MDN docs关于特性。

  • 尽可能使用 transform3d。我看到您在几个地方使用了 transformY,我发现 transform3d 通常会为转换提供一些很好的优化。

  • 我喜欢尽可能避免transition:all ...。老实说,我没有任何证据支持它,但我发现最好的做法是只转换您明确要转换的内容。

  • 最后,这可能很简单,因为您的 macbook 较旧或打开了很多程序。你能确认它在快速计算机上做同样的事情吗?也就是说,如果您的 macbook 较旧。

希望对您有所帮助!如有任何更新,请随时发表评论。

关于javascript - CSS 转换极度滞后的视网膜显示,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38256786/

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