JavaScript部分案例

本文轉載自查看原文 2019-10-28 23:55 433 JavaScript/ 原生JavaScript

JavaScript 是 Web 的編程語言。

所有現代的 HTML 頁面都使用 JavaScript。

JavaScript 非常容易學。

閱讀本教程，您需要有以下基礎：

PS ：JavaScript 一直在升級，請等待

01、電燈的開關

<img id="light" src="img/off.gif">
<script>
    /*
        1、獲取圖片對象
          2、綁定點擊事件
           3、切換圖片
                使用flag標注狀態
    * */
        var element = document.getElementById("light");
        var flag = false;//關閉狀態

        element.onclick = function (ev) {
            if(flag){//如果燈開着
                element.src = "img/off.gif";
                flag = false;
            }else{
                element.src = "img/on.gif";
                flag = true;
            }
        }
</script>

02、設置時間彈出鏈接
<p>
   <span id="time">5</span>之后跳轉
  </p>
  <script>
   var data = 5;
   function fun(){
    data--;
    if(data<=0){
     location.href="https://www.sina.cn";
    }
    time.innerHTML = data;
   }
   setInterval(fun,1000);
  </script>

 03、輪播圖
  <img src="img/img/banner_1.jpg" id="img" width="100%" />
  <script>
   var number =1;
   function fun(){
    number++;
    if(number>3){
     number=1;
    }
       var img =document.getElementById("img");
       img.src="img/img/banner_"+number+".jpg";
   }
   setInterval(fun,3000);
  </script>
 
 04.多級聯動

<select id="city">
    <option>成都</option>
    <option>德陽</option>
    <option>綿陽</option>
</select>
<script>
    var pro = document.getElementById("pro");
    var city = document.getElementById("city");
    function choice() {
        var _pro = pro.value
        switch (_pro) {
            case "sc":
                city.innerHTML = "<option>成都</option>\n" +
                       "       <option>德陽</option>\n" +
                       "       <option>綿陽</option>"
                break;
            case "cq":
                    city.innerHTML = "<option>重慶</option>";
                break;
            case "gd":
                      city.innerHTML = "<option>廣州</option>\n" +
                       "       <option>深圳</option>\n" +
                       "       <option>東莞</option>"
                break;
        }
    }
</script>

05.動態表格

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>動態表格</title>

}

        td, th {
            text-align: center;
            border: 1px solid;

}

        div {
            text-align: center;
            margin: 50px;
        }
    </style>

</head>
<body>

</div>

<table cellspacing="0" cellpadding="0">
    <caption>學生信息表</caption>
    <tr>
        <th>編號</th>
        <th>姓名</th>
        <th>性別</th>
        <th>操作</th>
    </tr>

             //3、創建td，賦值td的標簽體
             //id的td
             var td_id = document.createElement("td");
             var text_id = document.createTextNode(id);
             td_id.appendChild(text_id);
             //name的td
             var td_name = document.createElement("td");
             var text_name = document.createTextNode(name);
             td_name.appendChild(text_name);
             //gender的td
             var td_gender = document.createElement("td");
             var text_gender = document.createTextNode(gender);
             td_gender.appendChild(text_gender);
             //a標簽的td
             var td_a = document.createElement("td");
             var ele_a = document.createElement("a");
             ele_a.setAttribute("href","javascript:void(0)");
             ele_a.setAttribute("onclick","delTr(this);");
             var text_a = document.createTextNode("刪除");
             ele_a.appendChild(text_a);
             td_a.appendChild(ele_a);

             var tr = document.createElement("tr");
             tr.appendChild(td_id);
             tr.appendChild(td_name);
             tr.appendChild(td_gender);
             tr.appendChild(td_a);

document.getElementsByTagName("table")[0].appendChild(tr);
}*/

        // 1、獲取按鈕
        document.getElementById("btn_add").onclick = function () {
            //2、獲取文本框的內容
            var id = document.getElementById("id").value;
            var name = document.getElementById("name").value;
            var gender = document.getElementById("gender").value;
            //3、獲取table
            var table = document.getElementsByTagName("table")[0];
            // 4、追加一行
            table.innerHTML+="<tr>\n" +
                "        <td>"+id+"</td>\n" +
                "        <td>"+name+"</td>\n" +
                "        <td>"+gender+"</td>\n" +
                "        <td><a href=\"javascript:void(0);\" onclick=\"delTr(this);\">刪除</a></td>\n" +
                "    </tr>";

}

        // 刪除方法
        function delTr(obj) {
            var table = obj.parentNode.parentNode.parentNode;
            var tr = obj.parentNode.parentNode;
            table.removeChild(tr);
        }

</script>

</table>

</body>
</html>

06.表格全選

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表格全選</title>
    <style>
        table{
            border: 1px solid;
            width: 500px;
            margin-left: 30%;
        }

        td,th{
            text-align: center;
            border: 1px solid;
        }
        div{
            margin-top: 10px;
            margin-left: 30%;
        }

        .out{
            background-color: white;
        }
        .over{
            background-color: pink;
        }
    </style>

</script>

</head>
<body>

<table>
    <caption>學生信息表</caption>
    <tr>
        <th><input type="checkbox" name="cb" id="firstCb"></th>
        <th>編號</th>
        <th>姓名</th>
        <th>性別</th>
        <th>操作</th>
    </tr>

<tr>
        <td><input type="checkbox" name="cb" ></td>
        <td>3</td>
        <td>岳不群</td>
        <td>?</td>
        <td><a href="javascript:void(0);">刪除</a></td>
    </tr>
</table>
  
  <div>
      <input type="button" id="selectAll" value="全選" />
      <input type="button" id="unSelectAll" value="全不選" />
      <input type="button" id="selectRev" value="反選" />

     <script>
     var selectAll =document.getElementById("selectAll");
     var cbs =document.getElementsByName("cb");
     selectAll.onclick=function(){
       for (var i=0;i<cbs.length;i++) {
        cbs[i].checked = true;
       }
     }
     var unSelectAll =document.getElementById("unSelectAll");
     var cbs =document.getElementsByName("cb");
     unSelectAll.onclick=function(){
       for (var i=0;i<cbs.length;i++) {
        cbs[i].checked = false;
       }
     }
     var selectRev=document.getElementById("selectRev");
     var cbs =document.getElementsByName("cb");
     selectRev.onclick=function(){
       for (var i=0;i<cbs.length;i++) {
        cbs[i].checked = !cbs[i].checked;
       }
     }
     </script>
  </div>
</body>
</html>

07.輸出時間

 <script>
   var myDate =new Date();
   var year =myDate.getFullYear();
   var month =myDate.getMonth()+1;
   var day =myDate.getDate();
   var hour =myDate.getHours();
   var min =myDate.getMinutes();
   var second = myDate.getSeconds();
   //如果為單數時，在前面補0
   year = year < 10 ? "0" :year;
   month =month <10 ? "0" :month;
   day =day < 10 ? "0" :day;
   hour = hour <10 ? "0" :hour;
   min =min <10 ? "0" :min;
   second = second <10 ? "0" :second;
   //輸出時間
   document.write(year+"-"+month +"-"+day+"-"+hour+"-"+min+"-"+second);
  </script>

08.根據輸入的行和列，創建表格

<div>

請輸入你想創建的表格：

行：<input type="text" id="row">

列：<input type="text" id="col">
    <input type="button" id="creat" value="創建" onclick="creat()">
</div>

<div id="div1">
</div>
<script>
    function creat() {
        var row = document.getElementById("row").value;
        var col = document.getElementById("col").value;
        var div1 = document.getElementById("div1");

        var tab = "<table border=‘1‘ cellpadding=‘0‘ cellspacing=‘0‘ style=‘margin: 50px auto‘>";
        for (var i = 1; i <= row; i++) {
            tab += "<tr>";
            for (var j = 1; j <= col; j++) {
                tab += "<td style=‘width: 50px;height: 30px;‘>aa</td>";
            }
            tab += "</tr>";
        }
        tab += "</table>";
        div1.innerHTML = tab;
    }
</script>

09.表單驗證

<form id="form">
    用戶名：<input type="text" id="username" name="name" onblur="checkName()">
    <span id="sp_name"></span>
    <br>
    <input type="submit">
</form>

<script>
    window.onload = function (ev) {
        document.getElementById("form").onsubmit = function (ev1) {
            return checkName();
        }
    }
    function checkName() {
        var useranme = document.getElementById("username").value;
        var sp_name= document.getElementById("sp_name");
        var regExp = new RegExp("^.{3,20}$");
        if(regExp.test(useranme)){
            sp_name.innerHTML = "可以注冊";
            sp_name.style.color = "green";
            return true;
        }else{
            sp_name.innerHTML = "用戶名格式有誤";
            sp_name.style.color = "red";
            return false;
        }
    }
</script>

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