window.onload=function(){
var imgs=document.getElementsByTagName('img')
for(var i=0i<imgs.lengthi++){
imgs[i].setAttribute('class','nav')
}
}
<html><head>
<script type="text/javascript" src="scripts/jquery.1.8.2.min.js"></script>
<title></title>
<script type="text/javascript">
function changeSrc() {
document.getElementById("myImage").src = "image/5.gif"
// alert(0)
}
</script>
</head>
<body>
<img id="myImage" src="image/1.gif" />
<table id="qqstab"><tr><td><img src="image/1.gif"></td></tr></table>
<button id="myImage" onclick="changeSrc()">点击</button>
</body>
</html>
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