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第十天

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第十天

Json

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Json</title>
</head>
<body>
    <script>
        // restful架构,json
        // xml

        var json = {//对象
            id:1,
            link:"http://www.baidu.com",
            img:"img/1.jpg",
            content:"这是content",
            time:"2019-09-10"
        }
        //key键，value值，键值对
        for(var k in json){
            console.log(k,json[k]);
        }
        console.log(json.id);
        document.write(JSON.stringify(json));//将JSON变为字符串

        var str = JSON.stringify(json);//字符串
        var o = JSON.parse(str);//对象
        console.log(o.link);
    </script>
</body>
</html>

json实际应用

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>json</title>
    <style>
        ul,p{
            margin: 0;
            padding: 0;
        }
        li{
            list-style: none;
        }
        img{
            display: block;
            border: none;
        }
        a{
            text-decoration: none;
        }
        .jlist{
            display: flex;
        }
        .jlist>li{
            width: 33.3%;
            padding: 5px;
            box-sizing: border-box;
            font-size: 14px;
            line-height: 22px;
        }
        .jlist>li img{
            width: 100%;
        }
        .name{
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            color: #999;
        }
        .time{
            color: #ccc;
        }
    </style>
</head>
<body>
    <ul class="jlist">
        
    </ul>
    <script>
        // restful架构，json，前端与后台相分离

        // json加入网页：
        // 固定个数：事先写好html
        // 不固定个数，html都由js插入
        var json = [{
            id:1,
            link:"http://www.baidu.com",
            img:"../大作业/images/2.png",
            content:"这是content",
            time:"2019-09-10"
        },
        {
            id:2,
            link:"http://www.baidu.com",
            img:"../大作业/images/2.png",
            content:"这是content",
            time:"2019-09-10"
        },
        {
            id:3,
            link:"http://www.baidu.com",
            img:"../大作业/images/2.png",
            content:"这是content",
            time:"2019-09-10"
        }];
        var c = {
            data:json,
            date:"dddd"
        };

        var jlist = document.querySelector(".jlist");
        for(let i=0;i<json.length;i++){
            let hang = `
                <a href="${json[i].link}">
                    <img src="${json[i].img}" alt="">
                    <p class="name">${json[i].content}</p>
                    <p class="time">${json[i].time}</p>
                </a>
            `;
            let li = document.createElement("li");
            li.innerHTML = hang;
            jlist.appendChild(li);

        }
    </script>
</body>
</html>

基础BOM

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>bom</title>
    <style>
        #box{
            height: 4000px;
            background: linear-gradient(#000,#ffc);
        }
    </style>
</head>
<body>
    <div id="box" name="box"></div>
    <button>到顶部</button>
    <button>到顶部</button>
    <button>到顶部</button>
    <button>到顶部</button>
    <button>到顶部</button>
    <script>
        var btn  = document.querySelectorAll("button");
        var box = document.querySelector("#box");
        btn[0].onclick = function(){
            location.hash = "box";//根据name回到顶部
            location.hash = "";
        }
        btn[1].onclick = function(){
            window.scrollTo(0,0);
        }
        btn[2].onclick = function(){
            var st = document.body.scrollTop || document.documentElement.scrollTop;
            var timer = setInterval(function() {
                console.log(st);
                st-=30;
                window.scrollTo(0,st);
                if(st<0)clearInterval(timer);
            }, 1);
        }
        btn[3].onclick = function(){
            location.reload();
        }
        btn[4].onclick = function(){
            location.href = "test1.html";
        }
    </script>
</body>
</html>