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微博字数输入案例及总结

阿涛2019-06-29 15:01:06100

微博字数输入案例

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>微博输入</title>
    <style type="text/css">
        body{
            font-size: 12px;
        }
        .box{
            width: 600px;
            height: 160px;
            border:10px solid pink;
            margin: 0px auto;
            padding:10px;
        }
        img{
            float: left;
        }
        .box1{
            float: left;
            margin-left: 255px;
            width: 150px;
            height: 24px;
            text-align: right;
            font-size: 14px;
            color: #888;
        }
        .box1 span{
            font-size: 16px;
            font-weight: bold;
        }
        #text{
            width:600px;
            height: 100px;
            border: 1px solid #ccc;
            margin-top: 5px;
        }
        .box #sp1,#sp2,#sp3,#sp4,#sp5,#sp6{
            float: left;
            width: 30px;
            height: 32px;
            line-height: 32px;
            padding-left: 26px;
        }
        #sp1{
            background: url(images/an5.png) no-repeat left center;
        }
        #sp2{
            background: url(images/an4.png) no-repeat left center;
        }
        #sp3{
            background: url(images/an3.png) no-repeat left center;
        }
        #sp4{
            background: url(images/an2.png) no-repeat left center;
        }
        #sp5{
            background: url(images/an1.png) no-repeat left center;
            width: 40px;
        }
        #sp6{
            margin-left: 158px;
            margin-right:15px;
            color: #888;
        }
        #bt{
            float: left;
            width: 80px;
            height: 30px;
            border: none;
            background: #ffc09f;
            color: #fff;
            border-radius: 5px;
        }
    </style>


</head>
<body>
<div class="box">
    <img src="images/12.png">
    <div class="box1">还可以输入<span id="number"></span>字</div>
    <textarea id="text"></textarea>
    <span id="sp1">表情</span>
    <span id="sp2">图片</span>
    <span id="sp3">视频</span>
    <span id="sp4">话题</span>
    <span id="sp5">长微博</span>
    <span id="sp6">公开</span>
    <input type="button" value="发布" id="bt">

</div>

<script type="text/javascript">

    var text,number,m,bt;

    window.onload=function (){

        text=document.getElementById('text');

        number=document.getElementById('number');

        bt=document.getElementById('bt');

        text.onkeyup=function aa(){

            m=140-text.value.length;

            if(m<0){
                number.style.color="red"
            }else{
                number.style.color="#888"
            }
            number.innerHTML=m;
        }

        bt.onclick=function(){
            if (m==140) {
                alert("你还没有输入")
                text.focus()
            }else if(m<0){
                alert("字数太多,不可以发布")
                text.focus()
            }else{
                alert("发布成功")
            }
        }
    }
</script>
</body>
</html>

运行截图

QQ截图20190629145344.png

总结:

案例复习了html+css的基础知识

对于一些基础的js代码能自己敲出来,对于一些稍有难度的代码现在也能看懂,再接再厉!

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