css属性和js职中对应的关系案例:<!DOCTYPE html>
#div1{
width: 300px;
height: 300px;
border: 1px solid black;
}
</style>
<script type="text/javascript">
function change(val){
if(val == "big"){
//得到div对象 [属性和方法]
var div_obj = document.getElementById("div1");
//修改div的width和height的值
div_obj.style.width = "300px";
div_obj.style.backgroundColor="red";
}else if(val == "small"){
var div_obj = document.getElementById("div1");
//修改div的width和height的值
div_obj.style.width = "100px";
}
}
</script>
<div id="div1">
div
</div>
<img src="2.jpg" width="100px">