Javascript: Unicode string to hex and hex to string

function convertFromHex(hex) {

    var hex = hex.toString();//force conversion

    var str = '';

    for (var i = 0; i < hex.length; i += 2)

        str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));

    return str;

}

function convertToHex(str) {

    var hex = '';

    for(var i=0;i<str.length;i++) {

        hex += ''+str.charCodeAt(i).toString(16);

    }

    return hex;

}

78

Remember that a JavaScript code unit is 16 bits wide. Therefore the hex string form will be 4 digits per code unit.

usage:

var str = "\u6f22\u5b57"; // "\u6f22\u5b57" === "漢字"
alert(str.hexEncode().hexDecode());

String to hex form:

String.prototype.hexEncode = function(){
    var hex, i;

    var result = "";
    for (i=0; i<this.length; i++) {
        hex = this.charCodeAt(i).toString(16);
        result += ("000"+hex).slice(-4);
    }

    return result
}

Back again:

String.prototype.hexDecode = function(){
    var j;
    var hexes = this.match(/.{1,4}/g) || [];
    var back = "";
    for(j = 0; j<hexes.length; j++) {
        back += String.fromCharCode(parseInt(hexes[j], 16));
    }

    return back;
}

or

ar a = "\\x73\\x75\\x62\\x73\\x74\\x72"; var str = "\\u6f22\\u5b57"; String.prototype.hexDecode = function(){ var j; var hexes = this.split("\\"); var back = ""; for(j = 1; j<hexes.length; j++) { var xhex = hexes[j]; var hex = xhex.slice(1); back += String.fromCharCode(parseInt(hex, 16)); } return back; }; a.hexDecode(); //"substr" str.hexDecode(); //"漢字"