<html>
<title>圖片預加載</title>
<body>
<script>
//判斷瀏覽器
var Browser=new Object();
Browser.userAgent=window.navigator.userAgent.toLowerCase();
Browser.ie=/msie/.test(Browser.userAgent);
Browser.Moz=/gecko/.test(Browser.userAgent);
//判斷是否加載完成
function Imagess(url,imgid,callback){
var val=url;
var img=new Image();
if(Browser.ie){
img.onreadystatechange =function(){
if(img.readyState=="complete"||img.readyState=="loaded"){
callback(img,imgid);
}
}
}else if(Browser.Moz){
img.onload=function(){
if(img.complete==true){
callback(img,imgid);
}
}
}
//如果因為網絡或圖片的原因發生異常，則顯示該圖片
img.onerror=function(){img.src='http://www.baidu.com/img/baidu_logo.gif'}
img.src=val;
}
//顯示圖片
function checkimg(obj,imgid){
document.getElementById(imgid).src=obj.src;
}
//初始化需要顯示的圖片，並且指定顯示的位置
window.onload=function(){
Imagess("http://blog.moonsbird.com/wp-content/uploads/2017/04/cropped-82772650889143.58dc29485ed59.jpg","img1",checkimg);
Imagess("http://blog.moonsbird.com/wp-content/uploads/2017/04/cropped-82772650889143.58dc29485ed59.jpg","img2",checkimg);
Imagess("http://blog.moonsbird.com/wp-content/uploads/2017/04/cropped-82772650889143.58dc29485ed59.jpg","img3",checkimg);
Imagess("http://blog.moonsbird.com/wp-content/uploads/2017/04/cropped-8277.jpg","img4",checkimg);
Imagess("http://blog.moonsbird.com/wp-content/uploads/2017/04/cropped-82772650889143.58dc294","img5",checkimg);
}
</script>
<img id="img1" src="loading.gif" width="100" height="100" />
<img id="img2" src="loading.gif" width="100" height="100" />
<img id="img3" src="loading.gif" width="100" height="100" />
<img id="img4" src="loading.gif" width="100" height="100" />
<img id="img5" src="loading.gif" width="100" height="100" />
</body>
</html>
