JavaScript 实现的checkbox经典实例分享

<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title>邮件删除</title>
 <style type="text/css">
  *{
  margin: 0;
  padding: 0;
  }
  table{
  width: 400px;
  margin-left:200px;
  margin-top:20px;
  font-weight: bold;
  }
  th,td{
  padding: 7px;
  }
  #topOne{
  width: 80px;
  padding: 10px;
  }
  #topTwo{
  width: 120px;
  text-align: center;
  } 
  #topThree{
  width: 200px;
  text-align: center;
  }
  #endColspan{
  text-align: center;
  }
  #endColspan input{
  margin: 0 5px;
  }
 </style>
 </head>
 <body>
 <table border="2" cellspacing="0" cellpadding="">
  <!--第一行-->
  <tr id="top">
  <td id="topOne">
   <input type="checkbox" id="allInpTop" value="" />
   <span id="allSpanTop">全选</span>
  </td>
  <td id="topTwo">选择路线</td>
  <td id="topThree">请选择英雄</td>
  </tr>
  
  <!--第二行-->
  <tr id="content1">
  <td id="contentOne1">
   <input type="checkbox" name="" id="contentOne_input1" value="" />
  </td>
  <td id="contentTwo1">上单</td>
  <td id="contentThree1">德玛</td>
  </tr>
  <tr id="content2">
  <td id="contentOne2">
   <input type="checkbox" name="" id="contentOne_input2" value="" />
  </td>
  <td id="contentTwo2">中单</td>
  <td id="contentThree2">安妮</td>
  </tr>
  <tr id="content3">
  <td id="contentOne3">
   <input type="checkbox" name="" id="contentOne_input3" value="" />
  </td>
  <td id="contentTwo3">打野</td>
  <td id="contentThree3">螳螂</td>
  </tr>
  
  <!--第三行-->
  <tr id="end">
  <td id="endOne">
   <input type="checkbox" id="endOne_input" value="" />
   <span id="endOne_span">全选</span>
  </td>
  <td id="endColspan" colspan="2">
   <input type="button" name="" id="endColspan_btn1" value="全选" />
   <input type="button" name="" id="endColspan_btn2" value="取消全选" />
   <input type="button" name="" id="endColspan_btn3" value="反选" />
   <input type="button" name="" id="endColspan_btn4" value="删除所选邮件" />
  </td>
  </tr>
 </table>
 </body>
 <script type="text/javascript">
 
 var allInpTopObj = document.getElementById("allInpTop");
 
 var endOne_input = document.getElementById("endOne_input");
 
 var content1Obj = document.getElementById("content1");
 var content2Obj = document.getElementById("content2");
 var content3Obj = document.getElementById("content3");
 
 var contentOne_inputObj1 = document.getElementById("contentOne_input1");
 var contentOne_inputObj2 = document.getElementById("contentOne_input2");
 var contentOne_inputObj3 = document.getElementById("contentOne_input3");
 
 var endColspan_btn1Obj = document.getElementById("endColspan_btn1");
 
 var endColspan_btn2Obj = document.getElementById("endColspan_btn2");
 
 var endColspan_btn3Obj = document.getElementById("endColspan_btn3");
 
 var endColspan_btn4Obj = document.getElementById("endColspan_btn4");
 
 var luxianObj = document.getElementById("luxian");
 
 var renwuObj = document.getElementById("renwu");
 
 
 var strInput = [contentOne_inputObj1,contentOne_inputObj2,contentOne_inputObj3,allInpTopObj,endOne_input];
 
 var checks = [contentOne_inputObj1,contentOne_inputObj2,contentOne_inputObj3];
 
 var s = [content1Obj,content2Obj,content3Obj];
 
 
 var bool = true;
 var num;
 
 
 function pandaunFun () {
  if (allInpTopObj.checked = true) {
  allInpTopObj.checked = false;
  }
  if (endOne_input.checked = true) {
  endOne_input.checked = false;
  }
 }
 
 function allFun () {
  for (var i = 0; i < strInput.length; i++) {
  strInput[i].checked = true;//选中
  }
 }
 
 function cancelFun () {
  for (var i = 0; i < strInput.length; i++) {
  strInput[i].checked = false;//选中
  }
 }
 
 function unAllFun () {
  for (var i = 0; i < strInput.length; i++) {
  if (strInput[i].checked == true) {
   strInput[i].checked = false;//非选中
  } else{
   strInput[i].checked = true;//选中
  }
  }
  
  pandaunFun ();
 }
 
 function deleteFun () {
  for (var i = 0; i < s.length; i++) {
  if (checks[i].checked) {
   s[i].style.display = "none";
  }
  }
  
  pandaunFun ();
  
 }
 
 function numCheckFun () {
  num = 0;
  for (var j = 0; j < checks.length; j++) {
   
   if (checks[j].checked) {
   num++;
   }
  }
  
  if (num == checks.length) {
   allInpTopObj.checked = true;
   endOne_input.checked = true;
  }else{
   allInpTopObj.checked = false;
   endOne_input.checked = false;
  }
  }
 

 endColspan_btn1Obj.onclick = allFun;

 endColspan_btn2Obj.onclick = cancelFun;

 endColspan_btn3Obj.onclick = unAllFun;

 endColspan_btn4Obj.onclick = deleteFun;

 for (var i = 0; i < checks.length; i++) {
  checks[i].onclick = numCheckFun;
 }
 </script>
</html>