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核心内容
实例化image对象
监听load事件和error事件
为src赋上正确的图片路径
var image=new Image();
$(image).on('load error',function () {
});
image.src=src;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图片预加载</title>
<style>
html,body{
height: 100%;
}
a{
text-decoration: none;
}
.box{
text-align: center;
}
.btn{
display: inline-block;
height: 30px;
line-height: 30px;
border: 1px solid #ccc;
background-color: #fff;
padding: 0 15px;
margin-right: 50px;
color: #333;
}
.btn:hover{
background-color: #eee;
}
.loading{
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #eee;
text-align: center;
font-size: 5em;
}
.progress{
padding-top: 150px;
}
</style>
</head>
<body>
<div class="box">
<img src="img/scene0.jpg" alt="pic" id="img" width="1000px" height="500px"/>
<p>
<a href="javascript:;" class="btn" data-control="prev">上一页</a>
<a href="javascript:;" class="btn" data-control="next">下一页</a>
</p>
</div>
<div class="loading">
<p class="progress">0%</p>
</div>
<script src="js/jquery-1.9.1.min.js"></script>
<script>
var imgs=[
'img/scene0.jpg',
'img/scene1.jpg',
'img/scene3.jpg',
'img/scene4.jpg',
'img/scene5.jpg',
'img/scene6.jpg',
'img/scene7.jpg',
'img/scene8.jpg'
];
var index=0;
var len=imgs.length;
var count=0;
$progress=$('.progress');
$.each(imgs,function (i,src) {
var image=new Image();
$(image).on('load error',function () {
$progress.html(Math.round((count+1)/len*100)+'%');
if(count>=len-1){
$('.loading').hide();
}
count++;
});
image.src=src;
});
$('.btn').on('click',function () {
if("prev"===$(this).data('control')){
//上一张
index--;
if(index<0) index=0;
} else{
//下一张
index++;
if(index>len-1) index=len-1;
}
$('#img').attr('src',imgs[index]);
});
</script>
</body>
</html>
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