js对象的比较

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;
};

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