js function中返回function 闭包

来源：互联网发布：windows 返回桌面编辑：程序博客网时间：2024/04/19 15:58
<html><script>window.onload = function(){debuggera();b();function a(){for(var i =1;i<4;i++){var p = createElement("a", { href: "javascript:void(0)" });    p.appendChild(createElement("p", null, null, i));//就算onclick事件注册后也会被修改最新的i值p.onclick = function(){console.log(i);}document.getElementById('div').appendChild(p);}}function b(){for(var i =1;i<4;i++){var p1 = createElement("a", { href: "javascript:void(0)" });    p1.appendChild(createElement("p", null, null, i + 3));p1.onclick = function(c){return function(){console.log(c);};}(i + 3)//一开始写成这样 结果返回值一直都是7//p1.onclick = function(){//return function(c){//console.log(c);//}(i + 3);//}document.getElementById('div').appendChild(p1);}}}</script><head></head><body><div id='div'></div></body></html><script>function createElement(tagName, attributes, styles, text) {    var v = document.createElement(tagName);    if (attributes) {        for (var a in attributes) {            if (attributes[a]) {                if (a == "className") {                    v.className = attributes[a];                }                else {                    v.setAttribute(a, attributes[a]);                }            }        }    }    if (styles) {        for (var s in styles) {            v.style[s] = styles[s];        }    }    if (text) {        v.appendChild(document.createTextNode(text));    }    return v;}</script>
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