[JavaScript]一段把客户端的中文字串转换成UTF-8的代码
开发ASP.NET,我经常要在客户端的javascript代码中使用window.location='WebForm1.aspx?Param1=中文字串'来跳转页面，但在跳转之前必须要把中文字串转换成UTF-8的代码，否则如果中文字串中间存在空格之类的字符就会引起问题。
实际上IE 5.5+,Netscape 6+,Mozilla中已经有了转换函数，即encodeURIComponent，但对于低版本的浏览器则需要一下代码。
/* ***************************
** Most of this code was kindly
** provided to me by
** Andrew Clover (and at doxdesk dot com)
** http://and.doxdesk.com/ ;
** in response to my plea in my blog at
** http://worldtimzone.com/blog/date/2002/09/24
** It was unclear whether he created it.
*/
function utf8(wide) {
var c, s;
var enc = "";
var i = 0;
while(i<wide.length) {
c= wide.charCodeAt(i++);
// handle UTF-16 surrogates
if (c>=0xDC00 && c<0xE000) continue;
if (c>=0xD800 && c<0xDC00) {
if (i>=wide.length) continue;
s= wide.charCodeAt(i++);
if (s<0xDC00 || c>=0xDE00) continue;
c= ((c-0xD800)<<10)+(s-0xDC00)+0x10000;
}
// output value
if (c<0x80) enc += String.fromCharCode(c);
else if (c<0x800) enc += String.fromCharCode(0xC0+(c>>6),0x80+(c&0x3F));
else if (c<0x10000) enc += String.fromCharCode(0xE0+(c>>12),0x80+(c>>6&0x3F),0x80+(c&0x3F));
else enc += String.fromCharCode(0xF0+(c>>18),0x80+(c>>12&0x3F),0x80+(c>>6&0x3F),0x80+(c&0x3F));
}
return enc;
}
var hexchars = "0123456789ABCDEF";
function toHex(n) {
return hexchars.charAt(n>>4)+hexchars.charAt(n & 0xF);
}
var okURIchars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-";
function encodeURIComponentNew(s) {
var s = utf8(s);
var c;
var enc = "";
for (var i= 0; i<s.length; i++) {
if (okURIchars.indexOf(s.charAt(i))==-1)
enc += "%"+toHex(s.charCodeAt(i));
else
enc += s.charAt(i);
}
return enc;
}
function URLEncode(fld)
{
if (fld == "") return false;
var encodedField = "";
var s = fld;
if (typeof encodeURIComponent == "function")
{
// Use javascript built-in function
// IE 5.5+ and Netscape 6+ and Mozilla
encodedField = encodeURIComponent(s);
}
else
{
// Need to mimic the javascript version
// Netscape 4 and IE 4 and IE 5.0
encodedField = encodeURIComponentNew(s);
}
//alert ("New encoding: " + encodeURIComponentNew(fld) +
// "\n escape(): " + escape(fld));
return encodedField;
}
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