解构不仅可以用于数组，也可以用于对象。对象解构赋值与数组解构赋值有什么异同呢？
（1）对象的属性没有次序，变量必须与属性同名，才能渠道正确的值；
（2）指定默认值时，对象默认值生效的条件是：对象的属性值严格等于undefined；
（3）对象的解构赋值。可以很方便将现有对象方法赋值到某个变量。
案例2-1：对象的解构赋值.html
<script type="text/traceur"> var {name,age} = {name:"Zhangsan",age:12}; console.log(name); //Zhangsan console.log(age); //12 </script>
性质1：对象解构赋值不按照顺序
案例2-2：对象解构赋值不按照顺序.html
<script type="text/traceur"> var {name,age,id} = {id:"007",name:"Zhangsan",age:12}; console.log(name); //Zhangsan console.log(age); //12 console.log(id); //007 //若“007”不加双引号，即可以显示为7， </script> 解析：（1）当“id:007”时，此时的id为数值类型，会console.log(id);为“7”；
（2）当“id:"007"”时，此时的id为字符串类型，会console.log(id);为“007”。
案例2-3：变量和属性名不一致.html
<script type="text/traceur"> var {person_name,person_age,person_id} = {id:"007",name:"Zhangsan",age:12}; console.log(person_name); //undefined console.log(person_age); //undefined console.log(person_id); //undefined </script> 解析：上述案例中，person_name与name表明变量与属性名并不匹配，会显示“错误”。
解决办法：将person_name赋值给name即可
<script type="text/traceur"> var {name:person_name,age:person_age,id:person_id} = {id:"007",name:"Zhangsan",age:12}; console.log(person_name); //Zhangsan console.log(person_age); //12 console.log(person_id); //007 let object = {first:"Hello",last:"world"}; let {first:firstName,last:lastName} = object; console.log(firstName); //Hello console.log(lastName); //world </script> 案例2-4：对象解构默认值.html
<script type="text/traceur"> var { x=3 } ={}; console.log(x); //3 var { x,y = 5} = {x:1}; console.log(x); //1 console.log(y); //5 var {message:msg="You are a person!"}; console.log(msg); //You are a person! </script>
案例2-5：对象解构默认值条件.html
<script type="text/traceur"> var {x=3} = {x : undefined}; console.log(x); //3 var {y=3} = {y : null}; console.log(y); //null </script> 总结：默认值条件：对象的属性值严格等于undefined
案例2-6：已声明变量的解构赋值.html
<script type="text/traceur"> var x; ({x} = {x:1}); console.log(x); //1 </script> 案例2-7：现有对象的方法.html
<script type="text/traceur"> console.log(Math.sin(Math.PI/6)); //0.499999 let {sin,cos,tan,log} = Math; console.log(sin(Math.PI/6)); //0.499999 </script>
