<script type="text/javascript">代码</script> 转到.js里面

给a标签加个id：<a class="fun_down" id="fun_down" href="javascript:;" onclick="changeCss(this)">宽屏</a>

然后把下面这段拷到daima.js里就行了

function changeCss(obj){
var inner=obj.parentNode.innerHTML;
if(inner.inde