js实现背景图自适应窗口大小
话不多说，请看代码
<script type="text/javascript">
window.onresize = window.onload = function()
{
var w,bgImg;
if(!!(window.attachEvent && !window.opera)) {
w = document.documentElement.clientWidth;
} else {
w = window.innerWidth;
}if(w>1650){
document.getElementById ('msg').value ='窗口大小：' + 'width:' + w;
bgImg = document.getElementById('bg').getElementsByTagName('img')[0];
bgImg.width = (w - 5);
}else{
document.getElementById ('msg').value ='窗口大小：' + 'width:' + w;
bgImg = document.getElementById('bg').getElementsByTagName('img')[0];
bgImg.width = 1650;
}
}
</script>
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