<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Math</title>
<script type="text/javascript">
// var num = Math.random();
// alert(num);//彈出0-1之間的隨機(jī)數(shù)
var a = 1;
var b = 17;
// var num = Math.random()*(b-a)+a;
// alert(num);//彈出10-20之間的隨機(jī)數(shù)
var arr = [];
for(var i=0; i<20; i++){
// var num = Math.floor(Math.random()*(b-a)+a);//向下取整，10-19
var num = Math.floor(Math.random()*(b-a + 1)+a);//向下取整，10-20
arr.push(num);//生成一個(gè)數(shù)就放進(jìn)數(shù)組
}
alert(arr);//17,20,20,11,11,19,17,16,10,11,16,11,18,13,13,11,17,14,19,19
</script>
</head>
<body>
</body>
</html>
單體創(chuàng)建對(duì)象：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>單體創(chuàng)建對(duì)象</title>
<script type="text/javascript">
var Tom = {
// 屬性
name:'tom',
age:18,
// 方法
showName:function(){
alert(this.name);
},
showAge:function(){
alert(this.age);
}
}
//調(diào)用屬性
alert(Tom.name);
alert(Tom.age);
//調(diào)用方法
Tom.showName();
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>單體創(chuàng)建對(duì)象</title>
<script type="text/javascript">
var Tom = {
// 屬性
name:'tom',
age:18,
// 方法
showName:function(){
alert(this.name);
},
showAge:function(){
alert(this.age);
}
}
//調(diào)用屬性
alert(Tom.name);
alert(Tom.age);
//調(diào)用方法
Tom.showName();
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>工廠模式創(chuàng)建對(duì)象</title>
<script type="text/javascript">
function Person(name,age,job){
//創(chuàng)建一個(gè)空對(duì)象
// var o = new Object();//方式一
var o = {};//方式二
o.name = name;
o.age = age;
o.job = job;
o.showName = function(){
alert(this.name);
}
o.showAge = function(){
alert(this.age);
}
o.showJob = function(){
alert(this.job);
}
return o;
}
var Tom = Person('tom',18,'程序猿');
Tom.showJob();
var Jack = Person('jack',19,'攻城獅');
Jack.showJob();
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>構(gòu)造函數(shù)</title>
<script type="text/javascript">
function Person(name,age,job){
this.name = name;
this.age = age;
this.job = job;
this.showName = function(){
alert(this.name);
}
this.showAge = function(){
alert(this.age);
}
this.showJob = function(){
alert(this.job);
}
}
//new的作用就相當(dāng)于工廠模式中最開始創(chuàng)建了一個(gè)空對(duì)象，最后把對(duì)象返回
var Bob = new Person('bob',18,'產(chǎn)品汪');
Bob.showJob();
var Alex = new Person('alex',19,'運(yùn)營(yíng)喵');
Alex.showJob();
alert(Bob.showName == Alex.showName);//false
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>原型模式</title>
<script type="text/javascript">
function Person(name,age,job){
this.name = name;
this.age = age;
this.job = job;
Person.prototype.showName = function(){
alert(this.name);
}
Person.prototype.showAge = function(){
alert(this.age);
}
Person.prototype.showJob = function(){
alert(this.job);
}
}
//先去自己的對(duì)象中找showName函數(shù)，再去構(gòu)造函數(shù)的原型找
var Lucy = new Person('lucy',18,'測(cè)試鼠');
//重寫自身對(duì)象中的方法，不會(huì)影響其它對(duì)象
Lucy.showName = function(){
alert('我的名字是' + this.name);
}
Lucy.showName();//我的名字是lucy
var Lily = new Person('lily',19,'市場(chǎng)雞');
Lily.showName();//lily
alert(Lucy.showName == Lily.showName);//false
</script>
</head>
<body>
</body>
</html>
call和apply
<script type="text/javascript">
?/*? call和apply的區(qū)別
?? 二者都可以改變當(dāng)前的this，區(qū)別在于apply方法要將參數(shù)放入數(shù)組中再傳參*/
?? function aa(a,b){
? ? ? alert('我的this是' + this + ',我的a是' + a + ',我的b是' + b);
}
?? aa(2,3);
?? aa.call('abc',2,3);//我的this是abc,我的a是2,我的b是3
?? aa.apply('abc',[2,3])
call和apply都可以調(diào)用函數(shù)，可以用修改this??
傳參方式不同 call方法將參數(shù)直接放在? apply方法要將參數(shù)放入數(shù)組中再傳參
</script>
函數(shù)的繼承
<script type="text/javascript">
//父類
?? function Fclass(name, age){
? ? ? this.name = name;
? ? ? this.age = age;
}
?? Fclass.prototype.showName = function(){
? ? ? alert(this.name);
}
?? Fclass.prototype.showAge = function(){
? ? ? alert(this.age);
}
?? //子類
?? function Sclass(name, age, job){
?? //調(diào)用父類的call方法實(shí)現(xiàn)屬性的繼承
? ? ? this.job = job;
}
?? //方法的繼承 (父類的實(shí)例賦給子類的原型)
?? Sclass.prototype = new Fclass();
?? Sclass.prototype.showJob? = function(){
? ? ? alert(this.job);
};
?? var Driver = new Sclass('tom',18,'老司機(jī)')//創(chuàng)建一個(gè)子類的實(shí)例//
?? Driver.showJob();
?? Driver.showAge();
?? Driver.showName();
</script>
新增選擇器
<script type="text/javascript">
window.onload = function(){
?? var div1 = document.querySelector('#div1');
?? console.log(div1);
?? var lis = document.querySelectorAll('.list li');
?? console.log(lis.length);//8
}
<div id="div1">這是一個(gè)div元素</div>
<ul class="list">
?? <li>1</li>
?? <li>2</li>
?? <li>3</li>
?? <li>4</li>
?? <li>5</li>
?? <li>6</li>
?? <li>7</li>
?? <li>8</li>
</ul>
</script>
