javascript练习

程序员文章站 2022-04-02 10:41:57

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练习一：进行用户注册的验证

创建一个用户注册的验证脚本，手机号码需要负责规范，密码符合规定，并且输入验证码。效果如图：
javascript练习

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        .error {
            outline: 2px solid red;
        }

        .success {
            outline: 2px solid green;
        }

        .red {
            color: red;
        }

        .green {
            color: green;
        }

        #show {
            font-size: 30px;
            width: 100px;
            height: 61px;
            background: greenyellow;
            text-align: center;
            line-height: 61px;
            margin: 10px;
            border-radius: 5px;

        }
    </style>
</head>
<body>
<form action="">
    <label for="usename">用户名</label>
    <input type="text" id="usename">
    <span id="s1"></span>
    <br>
    <label for="password">密码</label>
    <input type="password" id="password">
    <span id="s2"></span>
    <br>
    <label for="qr">确认密码</label>
    <input type="password" id="qr">
    <span id="s3"></span>
    <br>
    <label for="yzm">验证码</label>
    <input type="text" id="yzm">
    <span id="s4"></span>
    <div id="show"></div>
    <input type="submit" id="tijiao">
</form>
<script>
    var usename = document.getElementById("usename");
    var password = document.getElementById("password");
    var qr = document.getElementById("qr");
    var yzm = document.getElementById("yzm");
    var show = document.getElementById("show");
    var tijiao = document.getElementById("tijiao");
    var s1 = document.getElementById("s1");
    var s2 = document.getElementById("s2");
    var s3 = document.getElementById("s3");
    var s4 = document.getElementById("s4");
    tijiao.disabled = "disabled";

    usename.onblur = function () {
//        console.log(usename.value);
        var tel = usename.value;
        /* if (/^(13|14|15|17|18)[0-9]{9}$/.test(tel)) {
         usename.className = 'success';
         s1.className = 'green';
         s1.innerHTML = "正确";
         }else {
         usename.className = 'error';
         s1.className = 'red';
         s1.innerHTML = "请输入正确的手机号";
         }*/
        if (tel.length == 11) {
            var arr = ['13', '14', '15', '17', '18','19'];
            if (arr.indexOf(tel.substr(0, 2)) > -1) {
                usename.className = 'success';
                s1.className = 'green';
                s1.innerHTML = "正确";
                puanduan();
            } else {
                usename.className = 'error';
                s1.className = 'red';
                s1.innerHTML = "请输入正确的手机号";
            }
        } else {
            usename.className = 'error';
            s1.className = 'red';
            s1.innerHTML = "请输入正确的手机号";
        }
    };

    password.onblur = function () {
        var mima = password.value;
        if (mima.length >= 6 && mima.length <= 12) {
            password.className = 'success';
            s2.className = 'green';
            s2.innerHTML = "正确";
            if (mima == qr.value) {
                qr.className = 'success';
                s3.className = 'green';
                s3.innerHTML = "正确";
                puanduan();
            }
            puanduan();
        } else {
            password.className = 'error';
            s2.className = 'red';
            s2.innerHTML = "请输入6到12位的密码";
        }

        /* if(mima==qr.value&&password.value!=""){
         qr.className = 'success';
         s3.className = 'green';
         s3.innerHTML = "正确";
         }else {
         qr.className = 'error';
         s3.className = 'red';
         s3.innerHTML = "2次密码不一致";
         }*/

    };
    qr.onblur = function () {
        var qrmm = qr.value;
        if (qrmm == password.value && password.value != "") {
            qr.className = 'success';
            s3.className = 'green';
            s3.innerHTML = "正确";
            puanduan();
        } else {
            qr.className = 'error';
            s3.className = 'red';
            s3.innerHTML = "2次密码不一致";
        }

    };

    show.onclick = function () {
//        var arr = [1,2,3,4,5,6,....."a",'b'..."A"]
        var str = '1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM';
        var jieguo = "";
        for (var i = 0; i < 4; i++) {
            var num = Math.floor(Math.random() * str.length);
            jieguo = jieguo + str[num];
        }
        show.innerHTML = jieguo;
//        sc();
    };
    /*function sc() {
     var str = '1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM';
     var jieguo = "";
     for(var i=0;i<4;i++){
     var num = Math.floor(Math.random()*str.length);
     jieguo = jieguo+str[num];
     }
     show.innerHTML = jieguo;
     }
     sc();*/

    /*var obj  = {
     getName:function () {
     console.log(111);
     }
     };
     obj.getName();*/
    show.onclick();

    yzm.onblur = function () {
        if (yzm.value.toLocaleUpperCase() == show.innerHTML.toLocaleUpperCase()) {
            yzm.className = 'success';
            s4.className = 'green';
            s4.innerHTML = "正确";
            /*if(s1.innerHTML=="正确"&&s2.innerHTML=="正确"&&s3.innerHTML=="正确"){
             tijiao.disabled = "";
             }*/
            puanduan();
        } else {
            yzm.className = 'error';
            s4.className = 'red';
            s4.innerHTML = "请输入正确的验证码";
        }
    };

    function puanduan() {
        if (s1.innerHTML == "正确" && s2.innerHTML == "正确" && s3.innerHTML == "正确" && s4.innerHTML == "正确") {
            tijiao.disabled = "";
        }
    }


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

练习二：三级联动表

制作一个可以选择省市区的三级下拉选项框。选中一个之后，会自动选中后面的第一个。效果如图：

javascript练习

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>三级菜单</title>
    <style>
        select{
            width: 200px;
            height: 30px;
        }
        span{
            margin-left: 10px;
        }
    </style>
</head>
<body>

<span>省：</span>
<select class="province" name="" id="1">
    <option value="">请选择</option>
</select>
<span>市：</span>
<select class="town" name="" id="2"></select>
<span>区：</span>
<select class="area" name="" id="3"></select>


<script>
    /*
     1.option元素的创建：var option = new Option('要显示的内容');
     2.将option元素添加到select元素中：select.options.add(option);
     3.将select元素中的option清空：select.options.length = 0;
     4.select元素有一个叫做selectedIndex,用来表示用户选中的这个option的序号，从0开始
     5.change事件会在select元素的value值发生改变的时候，自动调用
     */
    var provinceSelect =document.querySelector('.province');
    var townSelect =document.querySelector('.town');
    var areaSelect =document.querySelector('.area');
    var provinceArray =['北京市','上海市','天津市','江西省','河北省','山西省','山东省','河南省','陕西省'];
    var townArray = [
        ['北京市'],
        ['上海市'],
        ['天津市'],
        ['南昌市','赣州市','景德镇市','抚州市']];
    var areaArray = [
        [['海淀区','朝阳区','大兴区']],
        [['静安区','宝山区','青浦区']],
        [['天津一区','天津二区','天津三区']],
        [['青浦区','高兴区','南昌镇'], ['赣州一区','赣州二区','赣州三区'],['昌江区','浮梁县','乐平市']]
    ];


    for (var i = 0;i<provinceArray.length;i++){
        var provinceOption = new Option(provinceArray[i]);
        provinceSelect.options.add(provinceOption);
    }
    var provinceIndex = 0;
    provinceSelect.onchange =function(eve){

        if (provinceIndex ==-1){
            townSelect.options.length=0;
            areaSelect.options.length=0;
        }
        else
        {
            townSelect.options.length=0;
            areaSelect.options.length=0;
            provinceIndex= eve.target.selectedIndex-1;
            for (var j=0;j<townArray[provinceIndex].length;j++){
                var townOption = new Option(townArray[provinceIndex][j]);
                townSelect.options.add(townOption);}
            for (var k=0;k<areaArray[provinceIndex][0].length;k++){
                var areaOption = new Option(areaArray[provinceIndex][0][k]);
                areaSelect.options.add(areaOption);
            }

        }

    };

    townSelect.onchange = function(eve){
        areaSelect.options.length=0;
        var townIndex = eve.target.selectedIndex;
        for (var k=0;k<areaArray[provinceIndex][townIndex].length;k++){
            var areaOption = new Option(areaArray[provinceIndex][townIndex][k]);
            areaSelect.options.add(areaOption);
        }

    }



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

练习三：放大镜

创建和淘宝的左边图的样子一样，鼠标悬停可以放大图片查看细节，效果如图：
javascript练习

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>lesson5</title>
    <style>
        *{  margin: 0; padding: 0;  }
        .small{
            width: 400px;  height: 400px;  background: url("img/cat.png") no-repeat;
            background-size: 100%;  float: left; position: relative;
        }
        .small .fangdajing{  width: 100px; height: 100px;
            background-color: rgba(160,86,38,0.5); position: absolute;
            display: none;
        }
        .big{
            width: 400px;  height: 400px;  background: orange;  float: left;
            overflow: hidden; position: relative; display: none;
        }
        img{
            position: absolute;
        }
    </style>
</head>
<body>

<div class="small">
    <div class="fangdajing"></div>
</div>
<div class="big">
    <img src="img/cat.png" width="2000" height="2000" alt=""/>
</div>

<script>
    var smallDiv = document.querySelector('.small');
    var fangdajingDiv = document.querySelector('.fangdajing');
    var bigDiv = document.querySelector('.big');
    var img = document.querySelector('img');

    smallDiv.onmousemove = function (eve) {
        /*获取鼠标坐标*/
        var mouseLeft = eve.clientX;
        var mouseTop = eve.clientY;
        /*设置边界*/
        if(mouseLeft<50){mouseLeft = 50;}
        if(mouseLeft>350){mouseLeft = 350;}
        if(mouseTop<50){mouseTop = 50;}
        if(mouseTop>350){mouseTop = 350;}
        /*让放大镜div跟随鼠标移动*/
        fangdajingDiv.style.left = mouseLeft - 50 + 'px';
        fangdajingDiv.style.top = mouseTop - 50 + 'px';
        fangdajingDiv.style.display = 'block';
        /*让大图跟随放大镜移动*/
        img.style.left = mouseLeft * (-5) + 'px';
        img.style.top = mouseTop * (-5) + 'px';
        bigDiv.style.display = 'block';
    };
    smallDiv.onmouseleave = function (eve) {
        fangdajingDiv.style.display = 'none';
        bigDiv.style.display = 'none';
    }



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

javascript练习

练习一：进行用户注册的验证

练习二：三级联动表

练习三：放大镜

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javascript练习

练习一：进行用户注册的验证

练习二：三级联动表

练习三：放大镜

java基础知识练习题

JavaScript 利用Cookie记录用户登录信息_javascript技巧

CSS3+JavaScript实现炫酷呼吸效果的示例代码

JavaScript原型链详解

JavaScript实现拖放事件

javascript自定义in_array()函数实现方法_javascript技巧

Javascript学习笔记二 之 变量_基础知识

Node.js实战 建立简单的Web服务器_javascript技巧

如何提高javascript加载速度

解析JavaScript实现DDoS攻击原理与保护措施

Javascript学习笔记二之变量_基础知识

Node.js实战建立简单的Web服务器_javascript技巧