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Javascript Form - 如何处理TextField焦点丢失事件

text_input 【text_input】
我们想知道如何处理TextField焦点丢失事件。
代码展示 运行结果 

 

<html>
<head>
<script type="text/javascript" language="javascript">
function ChangeStatus(){
    console.log("focus lost");
    if (document.MyForm.MyTextField.value!==""){
        document.MyForm.Comments.readOnly = false;
        document.MyForm.Comments.select();
    } else{
        document.MyForm.MyTextField.focus();
    }
}
</script>
</head>
<body>
<table>
<form name="MyForm" action="" method="Post">
<tr>
 <td><input type="text" name="MyTextField" onblur="ChangeStatus()"/></td>
 <td>Enter your name</td>
</tr>
<tr>
 <td><textarea name="Comments" rows="6" cols="40">Please enter your name first</textarea></td>
 <td>Enter your comments.</td>
</tr>
<tr>
 <td><input type="submit" value="Click to Submit"/></td>
 <td>&nbsp;</td>
</tr>
</table>
</form>
</body>
</html>