javascript es6的常用语法你知道吗

const args='kenneth'
const args="kenneth"

Object.defineProperty(window,"args",{
value: ' this is es5',
writable: false
})

if(true){
const args=123
}
console.log(args)

console.log(args)
const args=1

var args=123
console.log(window.args)      //123

cosnt  args1=456
console.log(window.args1)    //cosnt不在window中

if(true){
console.log(infor)
const infor=123
}

const obj={
 id:1,
 age:18,
 name:'aaa'
}
obj.age=19       // cosnt 创建一个对象，对象中的属性可以被改变
//解决：冻结对象,一个被冻结的对象再也不能被修改
Object.freeze()
const obj2={
 id:2,
 name:'bbb',
 age:20,
 food:['banana','apple']
}
Object.freeze(obj2)
obj2.age=21                 //被Object.freeze（）冻结后，不可以改变    
obj2.foods[1]='pear'        //可以改变  freeze只能冻结根层 嵌套引用类型需要嵌套递归

//实现创建引用类型：
    function deepFreeze(obj) {
            Object.freeze(obj);
            (Object.keys(obj) || []).forEach((key) => {
                let innerObj = obj[key]
                if (typeof innerObj === 'object') {
                    deepFreeze(innerObj);
                }
            }
            )
        }

        const tempObj = {
            id: 23,
            name: '1',
            food: ['banana', 'apple']
        }
        deepFreeze(tempObj)

const args='kenneth'
const args="kenneth"

Object.defineProperty(window,"args",{
value: ' this is es5',
writable: false
})

if(true){
const args=123
}
console.log(args)

console.log(args)
const args=1

var args=123
console.log(window.args)      //123

cosnt  args1=456
console.log(window.args1)    //cosnt不在window中

if(true){
console.log(infor)
const infor=123
}

const obj={
 id:1,
 age:18,
 name:'aaa'
}
obj.age=19       // cosnt 创建一个对象，对象中的属性可以被改变
//解决：冻结对象,一个被冻结的对象再也不能被修改
Object.freeze()
const obj2={
 id:2,
 name:'bbb',
 age:20,
 food:['banana','apple']
}
Object.freeze(obj2)
obj2.age=21                 //被Object.freeze（）冻结后，不可以改变    
obj2.foods[1]='pear'        //可以改变  freeze只能冻结根层 嵌套引用类型需要嵌套递归

//实现创建引用类型：
    function deepFreeze(obj) {
            Object.freeze(obj);
            (Object.keys(obj) || []).forEach((key) => {
                let innerObj = obj[key]
                if (typeof innerObj === 'object') {
                    deepFreeze(innerObj);
                }
            }
            )
        }

        const tempObj = {
            id: 23,
            name: '1',
            food: ['banana', 'apple']
        }
        deepFreeze(tempObj)