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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<img class="backImg" src="" alt="图片">
<script>
window.onload = function (){
var imgWrap = document.getElementsByClassName('backImg');
var urls = [
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p579729551.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2315672647.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p510861873.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2503997609.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2455050536.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p1454261925.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p663036666.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p1280323646.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2364094053.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p792443418.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2522331945.jpg',
'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2189265085.jpg',
]
function preloadImg( url){
for(let i = 0;i< url.length;i++){
imgWrap[i] = new Image();
imgWrap[i].src = url[i];
}
// if( img.complete) {
// // 如果已有缓存时直接用回调函数
// val.setAttribute('src',url)
// return
// }
// img.onload = function (){
// img.onload = null
// }
}
preloadImg(urls)
}
</script>
</body>
</html>
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