js点击增加宽度

 

<div id="div1" style="width:300px;height:300px; background:pink;"></div>

<input type="button" value="改变大小" onclick="change();" />

<script type="text/javascript">

function change(){

 var div1=document.getElementById("div1");

 var div_width=div1.style.width;

 div_width=parseInt(div_width)+300+"px";

 div1.style.width=div_width;

}

</script>