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/**

* Created by Think on 2016/7/19.

// 以下代买为一个常规对象添加属性使其变成类数组对象，然后遍历生成的伪数组的"元素

// 创建一个类数组

var a = {}; // 从一个常规对象开始

var i = 0; // 添加一些属性，称为类数组

while (i < 10) {

a[i] = i * i;

i++;

}

a.length = i;

// 把类数组，当做数据遍历

var total = 0;

for(var j = 0 ; j < a.length; j++){

total += a[j];

}

console.log("把类数组，当做数据遍历计算结果：",total);

// 对象对象是否有为类数组对象

function isArrayLike(o){

if( o && // o 非null,undefine等

typeof o == 'object' && // o是对象

isFinite(o.length) && // o.length是有限制数组

o.length >= 0 && // o.length是有限数值

o.length === Math.floor(o.length) && // o.length是非负数

o.length < 4294967296){ // o.length < 2^32

return true; // o是类型数组对象

}else {

return false; // 否则不是

}

console.log(" 对象对象是否有为类数组对象：", isArrayLike(a));

// 可以间接的使用Funciton.call方法调用，使用Array方法

var arr = {"0":"a","1":"b",length:2};

console.log( Array.prototype.join.call(arr,'-').toString() );

// 将ECMAScript 5数组方法的版本在Array构造函数上定义为函数。

Array.join = Array.join || function(a,sep){

return Array.prototype.join.call(a,sep);

}

Array.slice = Array.slice || function(a,form,to){

return Array.prototype.slice.call(a,form,to);

}

Array.map = Array.map || function(a,f,thisArg){

return Array.prototype.map.call(a,f,thisArg);

}

Array.forEach = Array.forEach || function(a,f){

return Array.prototype.forEach.call(a,f);

}

Array.filter = Array.filter || function(a,f){

return Array.prototype.filter.call(a,f);

}

Array.reduce = Array.reduce || function(a,f,thisArg){

return Array.prototype.reduce.call(a,f,thisArg);

}

Array.reduceRight = Array.reduceRight || function(a,f){

return Array.prototype.reduceRight.call(a,f);

}

Array.some = Array.some || function(a,f){

return Array.prototype.some.call(a,f);

}

Array.every = Array.every || function(a,f){

return Array.prototype.every.call(a,f);

}

// 测试

console.log("join:",Array.join(a,"-"));

console.log("slice:",Array.slice(a,2,3));

console.log("map:",Array.map(a,function(a,b){ return a + b;}));

console.log("reduce:",Array.reduce(a,function(a,b){ return a + b;}),1);

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