有时候下载下来的文件名为URLencode后的编码，不知其真名是啥，很不方便，可以自行使用下面的HTML文件进行转换。将下面的代码另存为一HTML文件即可打开使用。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>URL 代码转换</title>
</head>
<body>
<form method="POST" name="form1">
<p><textarea rows="11" name="S1" cols="49"></textarea>
<input type="button" value="转换" name="B1" onclick="convert();">
<textarea rows="11" name="S2" cols="49"></textarea></p>
</form>
<script language="javascript">
var Url = {
// public method for url encoding
encode : function (string) {
return escape(this._utf8_encode(string));
},
// public method for url decoding
decode : function (string) {
return this._utf8_decode(unescape(string));
},
// private method for UTF-8 encoding
_utf8_encode : function (string) {
string = string.replace(/\r\n/g,"\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
}
else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
},
// private method for UTF-8 decoding
_utf8_decode : function (utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;
while ( i < utftext.length ) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
}
else if((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
}
else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
}
function convert(){
document.form1.S2.value = Url.decode(document.form1.S1.value);
}
</script>
</body>
</html>