為什么調(diào)用startMove函數(shù)時(shí)，對(duì)象只能是li1，而不能是this
?var li1=document.getElementById('li1');
??????????? li1.onmouseover= function () {
??????????????? startMove(li1,'width',400,function(){
??????????????????? startMove(li1,'height',200,function(){
??????????????????????? startMove(li1,'opacity',100);
??????????????????? });
??????????????? });
??????????? };
??????????? li1.onmouseout= function () {
??????????????? startMove(li1,'opacity',30,function(){
??????????????????? startMove(li1,'height',100,function(){
??????????????????????? startMove(li1,'width',200);
??????????????????? });
??????????????? });
??????????? };
2016-08-08
this 指代當(dāng)前對(duì)象 ?在onmouseout方法體中指代調(diào)用該方法的 li1對(duì)象 ? ?而在startmove中調(diào)用該函數(shù)的并不是 li1 對(duì)象 ?你可以 參考http://www.ibm.com/developerworks/cn/web/1207_wangqf_jsthis/這篇文章
2016-08-05
你可以在每一步的function中console.log（this） 就會(huì)發(fā)現(xiàn)在startMove 的回調(diào)函數(shù)中 this 已經(jīng)不是li1對(duì)象