Here is a function which can be run from the console or saved as a bookmarklet to generate a Unicode lookup table:
function Unicode() { var i = 0, unicode = {}, zero_padding = "0000", max = 9999; //Loop through code points while (i < max) { //Convert decimal to hex value, find the character, then pad zeroes to the codepoint unicode[String.fromCharCode(parseInt(i, 16))] = ("u" + zero_padding + i).substr(-4); i = i + 1; } //Replace this function with the resulting lookup table Unicode = unicode; } //Usage Unicode(); Unicode["%"];