<body>
<div>方法一:<input type="text" onclick="alert(this.value);" onfocus="this.blur()" /></div>
<div>方法二:<input type="text" onclick="alert(this.value);" readonly /> </div>
<div>方法三:<input type="text" onclick="alert(this.value);" disabled /> </div>
<div>方法四:<input type="text" disabled="disabled"/> </div>
</body>