（1）交换变量的值
案例1-1：ES5
<script type="text/traceur"> //ES5 console.log("ES5:"); var a =100; var b= 200; console.log("交换前："); console.log("a="+a); console.log("b="+b); var temp; temp=a; a=b; b=temp; console.log("交换后："); console.log("a="+a); console.log("b="+b); </script> 解析： 交换前：a=100 b=200交换后：a=200 b=100
案例1-2：ES6
<script type="text/traceur"> //ES6 console.log("ES6:"); var x=100; var y=200; console.log("交换前："); console.log(x); console.log(y); //采用解构赋值 [x,y] = [y,x]; console.log("交换后："); console.log(x); console.log(y); </script> 解析： 交换前：a=100 b=200
交换后：a=200 b=100
（2）从函数返回多个值
2-1：返回数组.html
function fun(){ return [1,2,3]; }; var [x,y,z] = fun(); console.log(x); //1 console.log(y); //2 console.log(z); //3 2-2：返回一个对象.html
function fun(){ return { id:"007", name:"Zhangsan", age:12 }; }; var {id,name,age} = fun(); console.log(id); //007 console.log(name); //Zhangsan console.log(age); //12 var {id:person_id,name:person_name,age:person_age} =fun(); console.log(person_id); //007 console.log(person_name); //Zhangsan console.log(person_age); //12
（3）函数参数的定义
//参数是一组有次序的值 function fun([x,y,z]){ //x=100; //y=200; //z=300; } fun([100,200,300]); //参数是一组无次序的值 function fun(){ //id="007", //name="Zhangsan", //age=12; }; fun({id:"007",name:"Zhangsan",age:12});
（4）提取json数据
<script type="text/traceur"> var jsonData={ id:"007", name:"Zhangsan", age:12, score:{ Chinese:101, Math:120, English:130 } }; console.log(jsonData); console.log("ES5:"); console.log("Person's name is:" + jsonData.name); console.log("Person's Chiese score is:" + jsonData.score.Chinese); console.log("ES6:"); let {id:number, name, age, score:score} = jsonData; console.log("Person's id is:" + number); //007 console.log("Person's age is:" +age); //12 console.log("Person's Chinese score is:" +score.Chinese); //101 </script> （5）函数参数的默认值
<script type="text/traceur"> jQuery.ajax({ url:'add.php', type:'POST', dataType:'xml/html/script/json/jsonp', data:{param1:'value'}, complete:function(xhr,textStatus){ // }, success:function(data,textStatus,xhr){ // }, error:function(xhr,testStatus,errorThrown){ // } }); jQuery.ajax = function(url,{ async = true; beforeSend=function(){}, cache=true, complete=funtion(){}, crossDomain=false, global=true, }){ }; </script> 解析：上述方法中，避免了函数体内部再写var foo = config.foo || 'default foo';这样的语句。
第一种：为直接函数进行方法使用；第二种：更接近于对象的概念进行函数赋值。
（6）遍历Map[地图]结构
<script type="text/traceur"> var map=new Map(); map.set("id","007"); map.set("name","Zhangsan"); console.log(map); //Map{"id"=> "007","name"=> "Zhangsan"} //获取键名和键值 for(let [key,value] of map){ console.log(key+"is" + value); }; //id is 007 //name is Zhangsan //获取键值 for(let [key] of map){ console.log(key); } //id //name </script>
（7）输入模块的指定方法
<script type="text.traceur"> const {SourceMapConsumer,SourceNode} = require("source-map"); </script>
