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committedDec 13, 2022
核心篇
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‎【核心篇】1.变量的本质&垃圾回收/html/JS中的字符串.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<script>
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var a = {
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a:1
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};
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console.log(a.a);
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</script>
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</body>
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</html>

‎【核心篇】1.变量的本质&垃圾回收/js/BaseType.js

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var
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b1 = 1,
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b2 = b1;
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b2 = 2;
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console.log(b1, b2);
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var
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r1 = {
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a: 1,
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},
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r2 = r1;
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r2.a = 2;
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console.log(r1.a, r2.a);

‎【核心篇】1.变量的本质&垃圾回收/js/DeepCopy.js

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//key:字符串
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var person1 = {
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age: 28,
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hobby: "学习",
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son: {
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age: 3,
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hobby: "drink milk",
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friends: ['jack', 'lucy']
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}
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}
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// function clone1(obj) {
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// return obj;
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// }
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// var clonePerson = clone1(person1);
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// console.log(clonePerson);
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// console.log(clonePerson === person1);
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//in会读原型链可枚举的属性
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//浅拷贝
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function clone2(obj) {
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var clonePerson = Array.isArray(obj) ? [] : {};
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for (var key in obj) {
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// 为什么不用clonePerson.key
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// 读对象的属性 1. person.age person[age]
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clonePerson[key] = obj[key];
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}
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return clonePerson;
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}
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var newPerson = clone2(person1)
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newPerson.son.age = 100;
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console.log(person1.son.age);
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// var clonePerson = clone2(person1);
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// console.log(clonePerson);
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// console.log(clonePerson === person1);
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// clonePerson.son.age = 100;
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// console.log(clonePerson);
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// console.log(person1);
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//-------------------------深拷贝
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function clone3(obj) {
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if (typeof obj !== 'object' || obj === null) {
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return obj;
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}
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var clone = Array.isArray(obj) ? [] : {};
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for (var key in obj) {
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if (typeof obj[key] === 'object') {
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//obj[key]; -> 新建 -> 新对象的地址
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clone[key] = clone3(obj[key]);
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} else {
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clone[key] = obj[key];
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}
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}
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return clone;
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}
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// var clonePerson = clone3(person1);
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// console.log(clonePerson === person1);
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// clonePerson.son.age = 100;
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// clonePerson.son.friends = ['tom'];
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// console.log(clonePerson);
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// console.log(person1);

‎【核心篇】1.变量的本质&垃圾回收/js/值传递.js

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//js: 值-->读stack内存里的值
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function change1(arg) {
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arg = 200;
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}
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function change2(arg) {
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arg.a = 200;
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}
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var foo = { a: 2, b: { x: 1 } };
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console.log(foo);
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foo = {};//手动释放
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// change1(bar);

‎1.js前世今生/任务.md ‎【浏览器篇】1.js前世今生/任务.md

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