<html>
<head>
<title>Page?Title</title>
<meta?http-equiv="Content-Type"?content="text/html;?charset=UTF-8"?/>
<script>
onload?=?function()?{
var?imgs?=?document.querySelectorAll("img");
console.log("加載中...");
for?(var?i?=?0;?i?<?imgs.length;?i++)?{
var?img?=?imgs[i];
(function(i)?{
setTimeout(function()?{
img.src?=?"a"?+?i?+?".jpg";
img.onload?=?function(){
if(i?==?imgs.length?-?1){
console.info("加載完畢");
}
}
img.onerror?=?function(){
console.error("加載錯誤");
}
},?2000?*?i);
})(i);
}
}
</script>
</head>
<body>
<img?/>
<img?/>
<img?/>
<img?/>
</body>
</html>