let pro = new Proxy({
add: function (val) {
return val + 100;
},
name: 'i am '
}, {
get: function (target, k...
yekong
1周前 (09-07) 39℃
0喜欢
不允许重复值
let weakObj = new WeakSet()
let obj = {a: 'wanjunshijie', b: 'wanjunshijie.com'}
weakObj.add(obj)
console.log(weakObj...
yekong
1周前 (09-07) 47℃
0喜欢
let setArr=new Set(['wanjunshijie','完俊世界','完俊世界','web'])
setArr.add('html')
console.log(setArr)
cons...
yekong
1周前 (09-07) 40℃
0喜欢
let a = Symbol();
let obj = {
[a]: 'wanjunshijie'
}
console.log(obj[a])
obj[a] = 'web'
console.log(obj[a])
let a = Symb...
yekong
1周前 (09-07) 40℃
0喜欢
Object.assign
let a = {a: 'wanjunshijie'}
let b = {b: '完俊世界'}
let c = {c: 'web'}
let d = Object.assign(a, b, c)
cons...
yekong
1周前 (09-07) 38℃
0喜欢
===同值相等
Object.js严格相等
console.log(+0===-0) //true
console.log(NaN===NaN) //false
console.log(Object.is(+0,-0)) //false
console.log(Object.i...
yekong
1周前 (09-07) 46℃
0喜欢
let key = 'skill'
var obj = {
[key]: 'web'
}
console.log(obj)
执行结果
...
yekong
1周前 (09-07) 44℃
0喜欢
for of
let arr = ['ceshi', 'wanjun', 'wanjunshijie']
for (let val of arr) {
console.log(val)
}
map
let arr = [&...
yekong
1周前 (09-07) 39℃
0喜欢
let arr = ['wanjunshijie', 'wanjunshijie1', 'wanjunshijie2']
arr.map((val, index) => {
console.log(index, val...
yekong
1周前 (09-07) 38℃
0喜欢
let arr = ['wanjunshijie', 'wanjunshijie1', 'wanjunshijie2']
console.log(arr.map(x => 'web'))
运行结果
['...
yekong
1周前 (09-07) 41℃
0喜欢
