函数封装总结

函数获取非行间样式兼容写法 obj.currentStyle[attr]和getComputedStyle(obj, false)[attr]

#div1 {200px; height:200px; background:red;}
<script>
function getStyle(obj, name)
{
    if(obj.currentStyle)
    {
        return obj.currentStyle[name];
    }
    else
    {
        return getComputedStyle(obj, false)[name];
    }
}

window.onload=function ()
{
    var oDiv=document.getElementById('div1');
        
    alert(getStyle(oDiv, 'backgroundColor'));//background、border属于复合样式需要写成backgroundColor, borderWidth
};
</script> 
<div id="div1"></div>