闭包的问题

Question

var j =i;
似乎多余。

Answer 1

这为什么非要闭包呢，这样不行么？function Tab(){
    var tabArr = $('tab').getElementsByTagName('a');
    var contArr = getElementsByClassName('hotestCont');    for( var i=0; i<tabArr.length; i++ ){
            tabArr[i].onmouseover= function(){
                this.className = 'here';
                contArr[i].style.display="block";
            };
            tabArr[i].onmouseout= function(){
                this.className = '';
                contArr[i].style.display="none";
            };
            contArr[i].onmouseover=function(){
                tabArr[i].className = 'here';
                this.style.display="block";
            };
            contArr[i].onmouseout=function(){
                tabArr[i].className = '';
                this.style.display="none";
            }
    }
}

Answer 2

改成这样或许lz会好理解些
function Tab(){
    var tabArr = $('tab').getElementsByTagName('a');
    var contArr = getElementsByClassName('hotestCont');    for( var i=0; i<tabArr.length; i++ ){
        (function(oTab, oCont){
            oTab.onmouseover= function(){
                this.className = 'here';
                oCont.style.display="block";
            };
            oTab.onmouseout= function(){
                this.className = '';
                oCont.style.display="none";
            };
            oCont.onmouseover=function(){
                oTab.className = 'here';
                this.style.display="block";
            };
            oCont.onmouseout=function(){
                oTab.className = '';
                this.style.display="none";
            }
        })(tabArr[i]，contArr[i])    }
}