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liujun
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5.3
1 parent 5fada80 commit 6e7bdcc

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‎test/html/arrayTest.html‎

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console.log(arr); // [4, 3, "chenyi"]
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console.log(arr.splice(0,1,'i love my sun')); // [4] 返回的是删除元素
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console.log(arr); // ["i love my sun", 3, "chenyi"]
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console.log(arr.splice(0,1,'i love my chenyi')); // [4] 返回的是删除元素
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console.log(arr); // ["i love my chenyi", 3, "chenyi"]
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console.log(arr.splice(1,2)); // [3,"chenyi"] 返回的是删除元素 当第二个参数为0时，返回[];因为没有删除任何元素
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console.log(arr); // ["i love my sun"]

‎test/html/loops.html‎

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}
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</script>
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</body>

‎test/html/method.html‎

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<!DOCTYPE html>
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<html>
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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,chrome=1">
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<title>Examples</title>
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<meta name="description" content="">
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<meta name="keywords" content="">
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<link href="" rel="stylesheet">
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</head>
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<body>
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<script>
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// 在一个对象里绑定的函数，称为对象的方法
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var xiaoming = {
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alert: function(){
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console.log('alert重写');
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console.info(this);
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}
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}
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var oldAlert = window.alert;
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window.alert = xiaoming.alert;
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alert(); // alert重写 // window{}
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xiaoming.alert(); // alert重写 Object{}
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alert(3); // alert重写 // window{}
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alert = oldAlert;
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alert(3); // 3
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// javascript 全局作用域只有一个
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function getSex() {
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console.log(this.sex1);
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}
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var chenyi = {
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name: 'chenyi',
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birth: 2014,
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sex1: 'boy',
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sex: getSex,
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age: function() {
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var y = new Date().getFullYear();
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console.info(y); // 2017
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return y - this.birth; // this => chenyi
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},
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height: function() {
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var _this = this;
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function getHeight() {
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return _this.birth + 90;
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}
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return getHeight();
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}
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}
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console.log(chenyi.age()); // 3
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// age(); // age is not defined
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console.log(chenyi.height()); // NaN ==> 2104
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chenyi.sex(); // boy
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getSex.apply(chenyi,[]); // boy
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console.log(Math.max.apply(null,[7,1])); // 7
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console.log(Math.max.call(null,5,9)); // 9
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// 调用普通函数时用null 绑定 this
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var oldParseInt = parseInt;
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var count = 0;
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window.parseInt = function() {
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count++;
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oldParseInt.apply(null,arguments);
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}
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parseInt(4);
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parseInt(4);
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parseInt(4);
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console.log(count); // 3
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</script>
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</body>
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</html>

‎test/html/variable.html‎

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<!DOCTYPE html>
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<html>
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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,chrome=1">
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<title>Examples</title>
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<meta name="description" content="">
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<meta name="keywords" content="">
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<link href="" rel="stylesheet">
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</head>
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<body>
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<script>
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function a() {
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alert('声明的' + y);
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var y;
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y = 5;
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}
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a(); // undefined //变量声明会被提升 变量赋值不会被提升
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function b() {
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alert('没定义的' + y);
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}
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// b(); // throw error: y is not defined
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function abc() {
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var a = 1,
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b = 2,
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c = 3;
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console.info(a,b,c);
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}
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abc(); // 1,2,3
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var globalVariable = 'apple';
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console.log(window.globalVariable); // apple
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console.log(count(9,7)); // 16 // 函数声明也会被提升
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function count(a,b) {
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return a + b;
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}
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// console.info(count2(4,8)); // throw error : count2 is not a function
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var count2 = function (c,d) {
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return c + d;
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}
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console.info(count2(4,8)); // 12 // 变量赋值不会被提升即使是函数
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// 变量作用域在函数内部
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function foo() {
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for(var i = 0; i < 4; i++) {
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}
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console.log(i);
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}
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foo(); // 4
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function foo1() {
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for(let i = 0; i < 4; i++) {
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}
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console.log(i);
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}
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foo1(); // undefined
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// let 声明块级作用域
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for(var i = 0; i < 6; i ++) {
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setTimeout(function(){
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console.info(i); // 6
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})
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}
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for(let i = 0; i < 6; i ++) {
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setTimeout(function(){
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console.info(i); // 0,1,2,3,4,5
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})
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}
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</script>
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</body>
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</html>

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