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javascript基础与Jquery(方法,对象,JQ基础操作)2019年10月24日
渊的博客
Original
914 people have browsed it

1、重新赋值

实例

<script>
    var val=3;
    function func(){
        val=5;
        return val;
    }
    alert(func());
</script>

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重新赋值.png

2、对象使用

实例

<script>
     var obj=new Object();
    obj.name='php';
    obj.rand=function(){
        console.log(Math.random());
    }
    obj.sum=function(num1,num2){
        return num1+num2;
    }
    console.log(obj.name);
    console.log(obj.rand());
    console.log(obj.sum(1,7));
</script>

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对象.png

3、对象实例2

实例

<script>
   var obj='asdfasfasebc';
   var obj={};
   obj.name='php';
   obj.rand=function(){
     console.log(Math.random());
   }
   obj.rand();
   console.log(obj.name);
   console.log(obj);
</script>

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对象1.png

4、对象实例2

实例

<script>
    var obj={
        table:'abc',
        find:function(){
            return this.table;
        },
        where:function(){
            return this;
        }
    };

var obj2=obj;
obj2.table='abcdefghjkl';

var res=obj2.where().find();
console.log(res);
</script>

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对象2.png

5、javascript获取对象ID操作

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>Document</title>
</head>
<body style="margin:0;">
<div id="div1" class="div1" style="background:red;width: 100%;height: 50px;"></div>
<p id="p1" class="p1" style="background:green;width: 100%;height: 50px;"></p>
</body>
</html>
<script>
var res=document.getElementById('div1');
console.log(res);

</script>

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getid.png

6、javascript获取对象class

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>Document</title>
</head>
<body style="margin:0;">
<div id="div1" class="div1" style="background:red;width: 100%;height: 50px;"></div>
<p id="p1" class="p1" style="background:green;width: 100%;height: 50px;"></p>
</body>
</html>
<script>
var res=document.getElementsByClassName('div1');
console.log(res);

</script>

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getclass.png

7、jquery中each循环

实例

<script type="text/javascript">
 var arr=[1,2,3,4,5,6,8,0];
    $.each(arr,function(i,v){
        if(v==3 || v==6){
            return v;
        }
        console.log('索引:'+i+'值:'+v);
    });
</script>

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each.png

8、jquery选择器

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>Document</title>
    <script type="text/javascript" src="jquery-3.4.1.min.js"></script>
</head>
<body>
<div id="div1" style="background:red;width: 100%;height: 50px;"></div>
<p class="p1" style="background:green;width: 100%;height: 50px;"></p>
<button onclick="change_color_div()">改变div颜色</button>
<button onclick="change_size_p()">改变P人的大小</button>
</body>
</html>
<script type="text/javascript">
function change_color_div(){
     $('#div1').css('background','#00ff00');
}
function change_size_p(){
    $('.p1').css('width','200px');
}
</script>

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选择器.png

Correction status:qualified

Teacher's comments:写得不错哟
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