<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script type="text/javascript"> /*
注意点:
对象的解构赋值和数组的解构赋值 除了符号不一样, 其它的一模一样
数组解构使用[]
对象解构使用{}
*/ //左边的格式与右边的格式要一样。 /*let [a,b,c]=[6,66,666];
console.log(a,b,c);*/ //个数可以不一样. /*let [a,b]=[1,11,111];
console.log(a,b);
*/ /*let [a,b,c,d]=[1,11,111];
console.log(a,b,c,d);
*/ // 3.在数组的解构赋值中,如果右边少于左边, 我们可以给左边指定默认值 /*let [a,b,c=555]=[1,3];
console.log(a,b,c);
*/ let obj={ name:"cyg", age:666 }; /*let name=obj.name;
let age=obj.age;*/ //let {name,age}=obj; /* let {name,age}={name:"cyg",age:666};
console.log(name,age);*/ /*let {name} = {name: "lnj",age: 34};
console.log(name); */ /*let {name, age, height} = {name: "lnj",age: 34};
console.log(name, age, height); */ /*let {name, age, height = 1.80} = {name: "lnj",age: 34};
console.log(name, age, height);*/ // 注意点: 在对象解构赋值中, 左边的变量名称必须和对象的属性名称一致, 才能解构出数据 //let {a, b} = {name: "lnj",age: 34}; //console.log(a, b); // undefined undefined let {age} = {name: "lnj",age: 34}; console.log(age); // 34 </script> </body> </html>
对象解构赋值详解
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