<!DOCTYPE html>

<html lang="en">

<head>

<meta charset="UTF-8">

<title>对应位置</title>

<script src="../../../vendor/traceur.js"></script>

<script src="../../../vendor/bootstrap.js"></script>

<script type="text/traceur">

//   ES6允许按照一定模式，从数组和对象中提取值，对变量进行赋值，这被称为解构（Destructuring） 。

    // ES5

    var a = 1;

    var b = 2;

    var c = 3;

    // ES6

    var [a, b, c] = [1, 2, 3];

    console.log(a);    //1

    console.log(b);    //2

    console.log(c);    //3

--------------------------------------------------------

    let [foo, [[bar], base]] = [1, [[2], 3]];

    console.log(foo);    //1

    console.log(bar);    //2

    console.log(base);    //3

    let [, , third] = ["first", "second", "third"];

    console.log(third);    //third

    let [one, , three] = ["One", "Two", "Three"];

    console.log(one);    //One

    console.log(three);    //Three

    let [head, ...tail] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

    console.log(head);    //0

    console.log(tail);    //[1, 2, 3, 4, 5, 6, 7, 8, 9]

    let [head, tail] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

    console.log(head);    //0

    console.log(tail);    //1

----------------------------------------------------

    var [temp] = [];

    console.log(temp);    //undefined

    var [first, second] = [100];

    console.log(first);    //100

    console.log(second);//undefined

----------------------------------------------------    

    let [x, y] = [1, 2, 3];

    console.log(x);    //1

    console.log(y);    //2

    let [a, [b], c] = [1, [2, 3], 4];

    console.log(a);    //1

    console.log(b);    //2

    console.log(c);    //4

-----------------------------------------------

    var [temp = "string"] = [];

    console.log(temp);    //string，没有值走默认

    var [temp = "string"] = ["tempString"];

    console.log(temp);    //tempString，默认值和指定值冲突（指定值不为未定义）用指定值、指定值为未定义用默认值，

    var [x = "aaa", y] = ["bbb"];

    console.log(x);    //bbb

    console.log(y);    //undefined

    var [m, n = "aaa"] = ["bbb"];

    console.log(m);    //bbb

    console.log(n);    //aaa

    var [p, q = "aaa"] = ["bbb", undefined];

    console.log(p);    //bbb

    console.log(q);    //aaa

-------------------------------------------------------

    var [temp] = 1;            //正确写法:var [temp] = [1];  报错1[Symbol.iterator] is not a function at eval

    var [temp] = false;        //报错:false[Symbol.iterator] is not a function at eval

    var [temp] = NaN;        //报错:NaN[Symbol.iterator] is not a function at eval

    var [temp] = undefined; //报错:Cannot read property 'Symbol(Symbol.iterator)' of undefined at eval

    var [temp] = null;        //报错:Cannot read property 'Symbol(Symbol.iterator)' of null at eval

-------------------------------------------------------

</script>

</head>

<body>

</body>

</html>
<!DOCTYPE html>

<html lang="en">

<head>

<meta charset="UTF-8">

<title>Iterator接口</title>

<script src="../../../vendor/traceur.js"></script>

<script src="../../../vendor/bootstrap.js"></script>

<script type="text/traceur">

//只要某种数据结构具有Iterator接口，都可以采用数组形式的解构赋值。

    let [a, b, c] = new Set(["a", "b", "c"]);

    console.log(a);    //a

    console.log(b);    //b

    console.log(c);    //c

    function* fibs() {

        let a = 0;

        let b = 1;

        while (true) {

            yield a;

            [a, b] = [b, a + b];

        }

    };

    var [first, second, third, fourth, fifth, sixth] = fibs();

    console.log(sixth);    //5

</script>

</head>

<body>

</body>

</html>

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