JavaScript： <script> //----------------for用来遍历数组对象-- var i,myArr = [1,2,3]; for (var i =
JavaScript：
<script> //----------------for用来遍历数组对象-- var i,myArr = [1,2,3]; for (var i = 0; i < myArr.length; i++) { console.log(i+":"+myArr[i]); }; //---------for-in 用来遍历非数组对象 var man ={hands:2,legs:2,heads:1}; //为所有的对象添加clone方法，即给内置原型(object,Array,function)增加原型属性,该方法很强大，也很危险 if(typeof Object.prototype.clone ==="undefined"){ Object.prototype.clone = function(){}; } // for(var i in man){ if (man.hasOwnProperty(i)) { //filter,只输出man的私有属性 console.log(i,":",man[i]); }; } //输出结果为print hands:2,legs:2,heads:1 for(var i in man) {//不使用过滤 console.log(i,":",man[i]); } //输出结果为 //hands : 2 index.html:20 //legs : 2 index.html:20 //heads : 1 index.html:20 //clone : function (){} for(var i in man) { if(Object.prototype.hasOwnProperty.call(man,i)) { //过滤 console.log(i,":",man[i]); } } //输出结果为print hands:2,legs:2,heads:1</script>
<htmL><head><meta content="text/html;charset=utf-8" http-equiv="content-type"> <script type="text/javascript"> window.onload = function(){ var arrLi = {我的朋友:['哇哈哈','乐百氏','农夫山泉'],同学:['咖啡','果汁','果酒']}; var n = -1 for(var i in arrLi){ n++; document.body.innerHTML += '<ul>'+i+'</ul>'; var ul = document.getElementsByTagName('ul'); for (var j = 0; j < arrLi[i].length; j++) { ul[n].innerHTML += '<li>'+arrLi[i][j]+'</li>'; }; } } </script></head><body></body></htmL>
