this.style与a[i].style有啥区别 ，在我的印象中this就是a[i]啊，应该是记错了，请问到底有啥区别呢
a[i].onmouseover=function(){
this.style.backgroundColor="#f2f2f2";
}
a[i].onmouseover=function(){
a[i].style.backgroundColor="#f2f2f2";
}
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a[i].onmouseover=function(){
this.style.backgroundColor="#f2f2f2";
}
a[i].onmouseover=function(){
a[i].style.backgroundColor="#f2f2f2";
}
2016-10-17
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