js prototype使用大全详解

// 扩展本地对象

//We create the method prototype for our arrays 
//It only sums numeric elements 
Array.prototype.sum = function(){ 
   var len = this.length; 
   total = 0; 
   for(var i=0;i<len ;i++){ 
     if(typeof this[i]!= 'number') continue; 
        total += this[i]; 
    } 
   return total; 
};
// 调用如下
var myArray = [1,2,3,'hola']; 
myArray.sum(); 

Array.prototype.max = function(){ 
   return Math.max.apply('',this); 
} 

// 其他学习资源1
http://cymoft.blog.51cto.com/324099/63422

// 其他学习资源2
http://www.jb51.net/article/11199.htm

// 其他学习资源3
http://blog.csdn.net/chaojie2009/article/details/6719353