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JavaScript案例-全選效果

Original 2019-02-26 16:28:42 255
abstract:<!DOCTYPE html /><html>  <head>    <meta charset="utf-8" />    <title>JavaScript案例-全選效果</title>     <style

<!DOCTYPE html />

<html>

  <head>

    <meta charset="utf-8" />

    <title>JavaScript案例-全選效果</title>

    <style>

        *{

             margin:0px;

             padding:0px;

          }

         .box{

             width:100px;

             height:220px;

             margin:20px auto;

             padding:5px;

             border:1px solid #666;

             border-radius:5px;

      }

         .box input{

             margin:8px 5px;

          }

         .box hr{

             margin:4px 0px;

             background-color:#000;

          }

    </style>


    <script type="text/javascript">

        function checkAll(){      //創(chuàng)建函數(shù)

            var checkall,option;      //聲明兩個變量

            checkall=document.getElementById("checkall");      //獲取id="checkall"即全選

            option=document.getElementsByName("option[]");      //獲取name="option[]"即選項

            for (i=0;i<option.length;i++){          //循環(huán)顯示各選項狀態(tài)

                if(checkall.checked){                      //如果全選框被選中,各選項被選中

                    option[i].checked=true;

                 }else{                                                     //如果全選框未被選中,各選項也不被選中

                     option[i].checked=false;

                 }

            }

        }

    //input的checked屬性規(guī)定input元素首次加載時應當被選中。

    </script>

    </head>

    <body>

        <div class="box">

             <input type="checkbox" id="checkall" onclick="checkAll()" /><label for="checkall">全選</label><br />

             <!-- <label>為表單控件定義標簽 -->

             <hr />

            <input type="checkbox" name="option[]" />選項1<br />

            <input type="checkbox" name="option[]" />選項2<br />

            <input type="checkbox" name="option[]" />選項3<br />

            <input type="checkbox" name="option[]" />選項4<br />

            <input type="checkbox" name="option[]" />選項5<br />

            <input type="checkbox" name="option[]" />選項6<br />

        </div>


  </body>

</html>


Correcting teacher:韋小寶Correction time:2019-02-27 09:11:08
Teacher's summary:寫的很不錯了 全選在很多網(wǎng)站中都會使用到 不管是網(wǎng)站的前臺還是后臺基本上都會有 所以一定要好好掌握咯

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