//比较2个对象是否相同
function isObjEqual(o1,o2){
  var props1 = Object.getOwnPropertyNames(o1);
  var props2 = Object.getOwnPropertyNames(o2);
  if (props1.length != props2.length) {
    return false;
  }
  for (var i = 0,max = props1.length; i < max; i++) {
    var propName = props1[i];
    if (o1[propName] !== o2[propName]) {
      return false;
    }
  }
  return true;
}
var obj1 = {id:1,name:"张三"}
var obj2 = {id:2,name:"李四"}
var obj3 = {id:1,name:"张三",age:25}
var obj4 = {id:1,name:"张三"}
console.log(isObjEqual(obj1,obj2));//false
console.log(isObjEqual(obj1,obj3));//false
console.log(isObjEqual(obj1,obj4));//true

Object.prototype.vequal = function(obj){
  var props1 = Object.getOwnPropertyNames(this);
  var props2 = Object.getOwnPropertyNames(obj);
  if (props1.length != props2.length) {
    return false;
  }
  for (var i = 0,max = props1.length; i < max; i++) {
    var propName = props1[i];
    if (this[propName] !== obj[propName]) {
      return false;
    }
  }
  return true;
}
var obj1 = {id:1,name:"张三"}
var obj2 = {id:2,name:"李四"}
var obj3 = {id:1,name:"张三",age:25}
var obj4 = {id:1,name:"张三"}
console.log(obj1.equal(obj2));//false
console.log(obj1.equal(obj3));//false
console.log(obj1.equal(obj4));//true