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java-script-notes
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106.作用域的问题.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
      #total {
          width: 450px;
          margin-left: auto;
          margin-right: auto;
      }

      ul {
          list-style-type: none;
      }

      li {
          border-style: solid;
          border-width: 1px;
          padding: 5px;
          margin: 5px;
          background-color: #99ff99;
          float: left;
      }

      .inner {
          width: 400px;
          border-style: solid;
          border-width: 1px;
          margin: 10px;
          padding: 10px;
          float: left;
      }

      #employeeTable {
          border-spacing: 1px;
          background-color: black;
          margin: 80px auto 10px auto;
      }

      th, td {
          background-color: white;
      }

      #formDiv {
          width: 250px;
          border-style: solid;
          border-width: 1px;
          margin: 50px auto 10px auto;
          padding: 10px;
      }

      #formDiv input {
          width: 100%;
      }

      .word {
          width: 40px;
      }

      .inp {
          width: 200px;
      }
  </style>


  <script>
    window.onload = function () {
      // 1.点击超链接删除一个员工信息
      var allA = document.getElementsByTagName("a");
      for (var i = 0; i < allA.length; i++) {
        /*
			 * for循环会在页面加载完成之后立即执行，
			 * 	而响应函数会在超链接被点击时才执行
			 * 当响应函数执行时，for循环早已执行完毕
			 */
        alert("for循环正在执行" + i);
        allA[i].onclick = function () {
          alert("响应函数正在执行" + i);
        }
        return false;
      }
    }
  </script>

</head>
<body>
<table id="employeeTable">
  <tr>
    <th>Name</th>
    <th>Email</th>
    <th>Salary</th>
    <th>&nbsp;</th>
  </tr>
  <tr>
    <td>Tom</td>
    <td>tom@tom.com</td>
    <td>5000</td>
    <td><a href="javascript:;">Delete</a></td>
  </tr>
  <tr>
    <td>Jerry</td>
    <td>jerry@sohu.com</td>
    <td>8000</td>
    <td><a href="javascript:;">Delete</a></td>
  </tr>
  <tr>
    <td>Bob</td>
    <td>bob@tom.com</td>
    <td>10000</td>
    <td><a href="javascript:;">Delete</a></td>
  </tr>
</table>

<div id="formDiv">

  <h4>添加新员工</h4>

  <table>
    <tr>
      <td class="word">name:</td>
      <td class="inp">
        <input type="text" name="empName" id="empName"/>
      </td>
    </tr>
    <tr>
      <td class="word">email:</td>
      <td class="inp">
        <input type="text" name="email" id="email"/>
      </td>
    </tr>
    <tr>
      <td class="word">salary:</td>
      <td class="inp">
        <input type="text" name="salary" id="salary"/>
      </td>
    </tr>
    <tr>
      <td colspan="2" align="center">
        <button id="addEmpButton" value="abc">
          Submit
        </button>
      </td>
    </tr>
  </table>

</div>

</body>
</html>