日期:2014-05-17  浏览次数:20807 次

初学者特简单的问题!回复正确马上给分
<html>
<head>
<title>   New   Document   </title>
</head>
<body>
: <input   type= "text "   size= "4 "   value= "10 "   name= "fileSizeLimit "   id= "fileSizeLimit "/>   K
<input   type= "file "   name= "file1 "   id= "file1 "   size= "40 "   onchange= "changeSrc(this) "/>
<img   src= "about:blank "   id= "fileChecker "   alt= "test "     height= "18 "/>
       
<script   type= "text/javascript ">
var   oFileChecker   =   document.getElementById( "fileChecker ");
       
function   changeSrc(filePicker)
{
        oFileChecker.src   =   filePicker.value;
}
       
oFileChecker.onreadystatechange   =   function   ()
{
        if   (oFileChecker.readyState   ==   "complete ")
        {
                checkSize();
        }
}
       
function   checkSize()
{
        var   limit     =   document.getElementById( "fileSizeLimit ").value   *   1024;
       
        if   (oFileChecker.fileSize   >   limit)
        {
                alert( "too   large ");
        }
     
}
</script>    

</body>
</html>

如果上传的图片大,他会弹出一个对话框,点击确认,如何使文本域file1的值清空


------解决方案--------------------
document.getElementById( "file1 ").value = “”;
------解决方案--------------------
if (oFileChecker.fileSize > limit)
{
alert( "too large ");
window.location.reload(true);
}
------解决方案--------------------
文件域的value是只读的。