ES6 使用技巧

解构赋值 

const obj={code:200,ok:true};
const {code,ok}=obj;
const {ok:success}=obj;
console.log(code,ok,success);
const arr=['一','二'];
const [first,second]=arr;
console.log(first,second);

合并数组或对象

const a = [1,2,3];
const b = [1,5,6];
const c = [...a,...b];//[1,2,3,5,6]

const obj1 = {
  a:1,
}
const obj2 = {
  b:1,
}
const obj = {...obj1,...obj2};//{a:1,b:1}

判断包含

if([1,2,3,4].includes(2) ){
 
}
if("我是中国人".includes("中国") ){
 
}

非空的判断

if(target??'' !== ''){

}

const s='hello world!';
for (item of s){
   console.log(item);
}

const name = '刘德华';
const age = 34;
const result = `${name} 看起来很 ${age>50?'老':'年轻'}`;