第九节 ES6中对象的扩展

对象的赋值

let name = 'liyang';

let skill = '前端';
//之前
let objOld = {name:name,skill:skill};
console.log(objOld);
//现在
let nowObj = {name,skill};

console.log(nowObj);

//结果是一样的
//控制台打印
//{name: "liyang", skill: "前端"}
// {name: "liyang", skill: "前端"}

key值的构建对象

//key值的构建对象
//场景化，假如key值未知，

let keyval = 'skill';

var objKey = {
  [keyval]:"web"
}

console.log("objKey是",objKey);
//打印结果  {skill: "web"}

//自定义对象的方法

let globalFun = {
  add:function(a,b){
    return a + b
  }
}

console.log(globalFun.add(1,2));

这一个算是es5的知识吧！~_~

 

is()的用法

//is()  判断两个对象是否相等（严格相等），接收两个对象，返回值boolean

// ===  同值相等

console.log(+0 === -0);
console.log(NaN === NaN);

//打印结果 true false

console.log(Object.is(+0,-0));
console.log(Object.is(NaN,NaN));

//打印结果  false true(与上面的截然相反)
//总结 is()  判断两个对象是否相等（严格相等）,===  同值相等

//对象合并assign

let a = {name1:"liyang"};
let b = {name2:"JeneryYang"};
let c = {name3:"web"}; 

let all = Object.assign(a,b,c);

console.log(all);
//打印结果
//{name1: "liyang", name2: "JeneryYang", name3: "web"}