javascript實現urlencode

encode|javascript function UrlEncode(plaintext ) { // The Javascript escape and unescape functions do not correspond // with what browsers actually do... var SAFECHARS = "0123456789" + // Numeric "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + // Alphabetic "abcdefghijklmnopqrstuvwxyz" + "-_.!~*'()"; // RFC2396 Mark characters var HEX = "0123456789ABCDEF"; var encoded = ""; for (var i = 0; i < plaintext.length; i++ ) { var ch = plaintext.charAt(i); if (ch == " ") { encoded += "+"; // x-www-urlencoded, rather than %20 } else if (SAFECHARS.indexOf(ch) != -1) { encoded += ch; } else { var charCode = ch.charCodeAt(0); if (charCode > 255) { alert( "Unicode Character '" + ch + "' cannot be encoded using standard URL encoding.\n" + "(URL encoding only supports 8-bit characters.)\n" + "A space (+) will be substituted." ); encoded += "+"; } else { encoded += "%"; encoded += HEX.charAt((charCode >> 4) & 0xF); encoded += HEX.charAt(charCode & 0xF); } } } // for return encoded; }