js 16进制字符串互转

        /**
         * 16进制转换为字符串
         * @param hex
         * @returns {*}
         */
        function hexToString(hex) {
            var tmp = '';
            if (hex.length % 2 == 0 ) {
                for (var i = 0; i < hex.length; i += 2) {
                    tmp += '%' + hex.charAt(i) + hex.charAt(i + 1);
                }
            }
            return decodeURIComponent(tmp);
        }

        /**
         * 字符串转16进制
         * @param str
         * @returns {string}
         */
        function stringToHex(str) {
            var hex = "";
            for (var i = 0; i < str.length; i++) {
                hex += str.charCodeAt(i).toString(16);
            }
            return hex;
        }