将HTMLCollection/NodeList/伪数组转换成数组的实现方法-javascr

var obj={};
obj[0] = "一";
obj[1] = "二";
obj[2] = "三";
obj.length = 3;

var makeArray = function(obj){
return Array.prototype.slice.call(obj,0);
}
try{
Array.prototype.slice.call(document.documentElement.childNodes, 0)[0].nodeType;
}catch(e){
makeArray = function(obj){
var res = [];
for(var i=0,len=obj.length; i<len; i++){
res.push(obj[i]);
}
return res;
}
}

//定义一个函数fun,内部使用makeArray将其arguments转换成数组
function fun(){
var ary = makeArray(arguments);
alert(ary.constructor );
}
//调用
fun(3,5);


//假设页面上有多个段落元素p
var els = document.getElementsByTagName("p");
var ary1 = makeArray(els);
alert(ary1.constructor);


//特殊的js对象（如jquery对象）
var obj={};
obj[0] = "一";
obj[1] = "二";
obj[2] = "三";
obj.length = 3;

var ary2 = makeArray(obj);
alert(ary2.constructor);