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本篇內(nèi)容介紹了“ES6對(duì)象如何使用”的有關(guān)知識(shí),在實(shí)際案例的操作過程中,不少人都會(huì)遇到這樣的困境,接下來就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
JavaScript中對(duì)象:
var person={name:"Jack",age:20};
或:
var name = "jack"; var age = 20; var person = {name:name,age:age}; console.log(person.age); //20
ES6中的簡(jiǎn)潔表示:
let [name,age]=["jack",20]; let person = {name,age}; //等同person = {name: name,age: age} console.log(person.age); //20
JavaScript中對(duì)象方法:
var person = { SayHi:function() { console.log("hi"); } } person.SayHi(); //hi
ES6中簡(jiǎn)潔表示:
let person = { SayHi() { console.log("hi"); } } person.SayHi();
ES6允許用表達(dá)式作為屬性名,但是一定要將表達(dá)式放在方括號(hào)內(nèi):
var person = {["na"+"me"]:"jack",["a"+"ge"]:20}; console.log(person.age);
或
let str = "Hi"; let person = { ["Say"+str](){ console.log("hi"); } } person.SayHi();
注意點(diǎn):屬性的簡(jiǎn)潔表示法和屬性名表達(dá)式不能同時(shí)使用,否則會(huì)報(bào)錯(cuò):
let [name,age]=["jack",20]; let person = {["na"+"me"],["a"+"ge"]}; //報(bào)錯(cuò)
取出參數(shù)對(duì)象所有可遍歷屬性然后拷貝到當(dāng)前對(duì)象:
let stu1 = {name:"Jack",age:20,sex:"男"}; let stu2 = {...stu1}; console.log(stu2); //{name: "Jack", age: 20,sex:"男"}
合并兩個(gè)對(duì)象:
let stu1BasicInfo = {name:"Jack",age:20,sex:"男"}; let stu1DetailInfo = {phone:"13524521457",mail:"ldh@163.com"}; let stu = {...stu1BasicInfo,...stu1DetailInfo}; console.log(stu); //{name:"Jack",age:20,sex:"男",phone:"13524521457",mail:"ldh@163.com"}
拷貝對(duì)象時(shí)支持添加屬性:
let stu1 = {name:"Jack",age:20,sex:"男"}; let stu2 = {...stu1,phone:"13554785452"}; console.log(stu2); //{name:"Jack",age:20,sex:"男",phone:"13554785452"}
添加的屬性在拓展運(yùn)算符后面,取添加的屬性:
let stu1 = {name:"Jack",age:20,sex:"男"}; let stu2 = {...stu1,name:"rose",phone:"13554785452"}; console.log(stu2); //{name:"rose",age:20,sex:"男",phone:"13554785452"}
添加的屬性在拓展運(yùn)算度前面,取擴(kuò)展運(yùn)算符內(nèi)容:
let stu1 = {name:"Jack",age:20,sex:"男"}; let stu2 = {name:"rose",phone:"13554785452",...stu1}; console.log(stu2); //{name:"Jack",phone:"13554785452",age:20,sex:"男"}
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