js闭包问题

 1 function picLinkInit(parentClassName, imgW, imgH, childClassObjs) {
 2 var $match = $(parentClassName);
 3 var mWidth = Math.floor($match.width());
 4 
 5 var mHeight = computeHeight(mWidth, imgW, imgH);
 6 $match.css({
 7 "width": mWidth,
 8 "height": mHeight
 9 });
10 for (var i = 0; i < childClassObjs.length; i++) {
11 var childClassObj = childClassObjs[i];
12 
13         $(childClassObj.cName).css({
14 "width": Math.floor(mWidth * childClassObj.ratioMoleculeW / childClassObj.ratioDenominatorW),
15 // "background": "rgba(9,200,200,0.5)",
16 "height": Math.floor(mHeight * childClassObj.ratioMoleculeH / childClassObj.ratioDenominatorH)
17         });
18 /* if (childClassObj.url) {
19             $(childClassObj.cName).click(function () {
20                 window.location.href =childClassObj.url;
21             });
22         }*/
23 (function (i) {
24 if ( childClassObjs[i].url) {
25                 $( childClassObjs[i].cName).click(function () {
26                     window.location.href = childClassObjs[i].url;
27                 });
28             }
29         })(i);
30 
31     }
32 }

闭包表现:js没有块级元素，数组记录的是最后一个的 。跟作用域等有关。

封装成内部函数，把i传人进内部函数，这样外部函数不会调用到内部函数的变量。

(function (i) {
if ( childClassObjs[i].url) {
                $( childClassObjs[i].cName).click(function () {
                    window.location.href = childClassObjs[i].url;
                });
            }
        })(i);