json基础+实例（4）

贵哥的编程之路

发布于 2020-10-28 11:38:44

3040

发布于 2020-10-28 11:38:44

兄弟们，俺只讲核心哈就讲修改和删除把 //修改

myobj.ke[0]= "HTML教程"
        var i,x="";
		for(i in myobj.ke)
		{
			x = x + i + " | " + myobj.ke[i] + "<br>"
		}
		document.getElementById("demo02").innerHTML = x;

核心在于覆盖其他的有不懂的同学请看123哈，你真会跳啊兄dei

//删除

delete myobj.ke[2]
		var j,y = "";
		for(j=0;j<myobj.ke.length;j++)
		{
			y = y + myobj.ke[j] + "<br>"
		}
		document.getElementById("demo03").innerHTML = y;

	核心在于删除delete myobj.ke[2]，因为没有了，浏览器以为你没写就undefined啊，兄dei

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>

</head>

<body>

    <h2>JSON 数组04-对象中的数组-修改和删除</h2>
    
	<div id="demo01"></div><hr>
    <div id="demo02"></div><hr>
    <div id="demo03"></div>
 
    
    <script type="text/javascript">
 		var myobj;
		myobj={
			"xm":"黄菊华",
			"num":3,
			"ke":["html","css","js"]
			}
		document.getElementById("demo01").innerHTML =myobj.ke[0]+"<br>";
		document.getElementById("demo01").innerHTML = document.getElementById("demo01").innerHTML + myobj.ke[1]+"<br>";
		document.getElementById("demo01").innerHTML = document.getElementById("demo01").innerHTML + myobj.ke[2]+"<br>";

		//修改
		myobj.ke[0]= "HTML教程"
        var i,x="";
		for(i in myobj.ke)
		{
			x = x + i + " | " + myobj.ke[i] + "<br>"
		}
		document.getElementById("demo02").innerHTML = x;
		
		//删除
		delete myobj.ke[2]
		var j,y = "";
		for(j=0;j<myobj.ke.length;j++)
		{
			y = y + myobj.ke[j] + "<br>"
		}
		document.getElementById("demo03").innerHTML = y;
		
		
		
	</script>


</body>
</html>

兄弟们，核心来了，超级嵌套！！！！记住了，兄弟们，对象里面的是属性，数组里面的是下标从0开始的下标，核心哈· 比如这里面是吧·，对象里面的属性有name num sites sites属性里面的数组下标为 1{“name”:“淘宝”,“info”:[“购物网站”,“www.taobao.com”,“电商”]}, 2{“name”:“QQ”,“info”:[“综合网站”,“www.qq.com”,“综合”]}, 3{“name”:“百度”,“info”:[“搜索网站”,“www.baidu.com”,“搜索”]} 记住了，我前面说过了，属性里面也可以写数组的哈然后是对象里面的属性是name info 然后是对象里面的属性是数组 0[“购物网站”,“www.taobao.com”,“电商”] 1[“综合网站”,“www.qq.com”,“综合”] 2[“搜索网站”,“www.baidu.com”,“搜索”] 就这么简单，知道把

obj = {
			"name":"网站",
			"num":3,
			"sites":[
				{"name":"淘宝","info":["购物网站","www.taobao.com","电商"]},
				{"name":"QQ","info":["综合网站","www.qq.com","综合"]},
				{"name":"百度","info":["搜索网站","www.baidu.com","搜索"]}
			]
		}

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>

</head>

<body>

    <h2>1JSON 数组05-复杂的嵌套</h2>
    
	<div id="demo01"></div>
 
 
    
    <script type="text/javascript">
 		var obj,i,j,x ="";
		obj = {
			"name":"网站",
			"num":3,
			"sites":[
				{"name":"淘宝","info":["购物网站","www.taobao.com","电商"]},
				{"name":"QQ","info":["综合网站","www.qq.com","综合"]},
				{"name":"百度","info":["搜索网站","www.baidu.com","搜索"]}
			]
		}
		
		for(i in obj.sites)//遍历sites属性中的数组有3个
		{
			x = x + "<h1>" + obj.sites[i].name + "</h1>"//三次
			//然后是第一个（）下标0）name的值是：
			for(j in obj.sites[i].info)//然后是获取到"info":["购物网站","www.taobao.com","电商"]了，三次
			{
				x = x + obj.sites[i].info[j] + "<br>";//然后遍历要下{"name":"淘宝","info":["购物网站","www.taobao.com","电商"]},一共九次
				//里面的["购物网站","www.taobao.com","电商"]，之后的按照我的思路进行就行了
			}
		}
		
		document.getElementById("demo01").innerHTML =x;
		
	</script>


</body>
</html>