js转utf-8

function Utf8Encode(string) {      

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;   

}