Open itstrive opened 6 years ago
undefined 1 不要问我为什么
undefined //作用域链 变量提升 1 // let块级作用域 作用域链
// ES5:
> Math.max.apply(Math, [-10,90,300,20])
// ES6:
> Math.max(...[-10,90,300,20])
// ES5:
var arr1=[1,2];
var arr2=[3,4];
arr1.push.apply(arr1,arr2); //arr1 -> [1,2,3,4]
// ES6: const arr1=[1,2]; const arr2=[3,4]; arr1.push(...arr2); //arr1 -> [1,2,3,4]
- 分别用ES5和ES6的语法把多个数组拼接成一个数组?
```javascript
// ES5:
var arr1=['a','b'];
var arr2=['c'];
var arr3=['d','e'];
console.log(arr1.concat(arr2,arr3));
// ES6:
const arr1=['a','b'];
const arr2=['c'];
const arr3=['d','e'];
console.log([...arr1, ...arr2, ...arr3]);