js對象的比較

項目中需要比較兩個對象是否相等，給Object對象開展了（別緊張，別說我把它污染了），一個實現而已，象java一樣可以只給自己想要的類重寫equals方法。

		Object.prototype.equals = function(obj){
			if(this == obj) 
				return true;
			if(typeof(obj)=="undefined"||obj==null||typeof(obj)!="object") 
				return false;
			var length = 0; var length1=0;
			for(var ele in this) {
				length++;
			}				
			for(var ele in obj) {
				length1++;
			}				
			if(length!=length1) 
				return false;
			if(obj.constructor==this.constructor){
				for(var ele in this){
					if(typeof(this[ele])=="object") {
						if(!this[ele].equals(obj[ele]))
							return false;
					}
					else if(typeof(this[ele])=="function"){
						if(!this[ele].toString().equals(obj[ele].toString())) 
							return false;
					}
					else if(this[ele]!=obj[ele]) 
						return false;
				}
				return true;
			}
			return false;
		};

 

  firefox示例如下：

  var p1 = {name:"jack",age:18}; 
  var p2 = {name:"lucy",age:10}; 
  var p3 = {name:"jack",age:18}; 


  console.log(p1.equals(p2));//false 
  console.log(p1.equals(p3));//true 
  console.log(p1.equals({name:"jack",age:18}));//true