前端ABC<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style>
.wrap{
width: 100px;
margin: 0 auto;
}
</style>
</head>
<body>
<div class="wrap">
<img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1491155329182&di=d4de15ebf6db888e7a5a6beb9a84f487&imgtype=0&src=http%3A%2F%2Fimg13.360buyimg.com%2Fn4%2Fjfs%2Ft577%2F42%2F815970364%2F146404%2F4307cc0e%2F54ade3c5Naf9c500e.jpg" alt="" id="img1"/><br />
<input type="button" value="放大" id="btn1"/>
<input type="button" value="缩小" id="btn2"/>
</div>
<script>
window.onload=function(){
var oImg=document.getElementById('img1');
var oBtn1=document.getElementById('btn1');
var oBtn2=document.getElementById('btn2');
var maxWidth=oImg.width*2;
var maxHeight=oImg.height*2;
var minWidth=oImg.width*0.7;
var minHeight=oImg.height*0.7;
oBtn1.onclick=function(){
maxFun();
}
function maxFun(){
var addWidth=oImg.width*1.3;
var addHeight=oImg.height*1.3;
var timer=setInterval(function(){
if(oImg.width<addWidth){
if(oImg.width<maxWidth){
oImg.width=oImg.width*1.05;
oImg.height=oImg.height*1.05;
}else{
alert('图片不能再放大了！')
clearInterval(timer);
}
}else{
clearInterval(timer);
}
},120)
}
oBtn2.onclick=function(){
minFun();
}
function minFun(){
var subWidth=oImg.width*0.7;
var subHeight=oImg.height*0.7;
var timer=setInterval(function(){
if(oImg.width>subWidth){
if(oImg.width>minWidth){
oImg.width=oImg.width*0.95;
oImg.height=oImg.height*0.95;
}else{
alert('图片不能再放小了！');
clearInterval(timer);
}
}else{
clearInterval(timer);
}
},120)
}
}
</script>
</body>
</html>
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