Detailed explanation of destructuring assignment in ES6
This time I will bring you a detailed explanation of the destructuring assignment of ES6. What are the precautions for using the destructuring assignment of ES6?The following is a practical case, let's take a look.
@1 Destructuring assignment of array;let [a,b,c]=[1,2,3]; console.log(a,b,c) //1 2 3 ---------------------------------------------------------------- let [a=true]=[]; console.log(a) //a=true; ---------------------------------------------------------------- let[a=true]=[undefined]; let[b=true]=[null] console.log(a,b) //a=true,b=null
ObjectPointer
typeof null ==>object;而undefined可以认为在下面两种情况会出现;
let[a=true]=[undefined]; let[a=true]=[ ];
let {foo,bar}={bar:"liuhf",foo:true}; //跟键的顺序没有关系;Destructuring assignment of string;
const [a,b,c,d,e,f]="liuhee"; console.log(a,b,c,d,e,f); // l i u h e e
let json = {
a: '对',
b: '象'
}
//对象的函数解构;
function fun({ a, b = 'jspang' }) {
console.log(a, b);
}
fun(json);
//数组的函数解构;
let arr = ["liu", "hai"]
function fun1([a, b]) {
console.log(a, b);
}
fun1(arr);
console.log("------------");
//或者;
function fun2(a, b) {
console.log(a, b);
}
fun2(...arr);Entry, output, module analysis of webpack3.x
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