JS-unicode编码转换

<script type="text/Javascript">
var toUN = {
    on: function(str) {
        var a = [],
        i = 0;
        for (; i < str.length;) a[i] = ("00" + str.charCodeAt(i++).toString(16)).slice( - 4);
        return "\\u" + a.join("\\u")
    },
    un: function(str) {
        return unescape(str.replace(/\\/g, "%"))
    }
};
alert(toUN.on("\"请输\""));
alert(toUN.un("\\u0022\\u8BF7\\u8F93\\u0022"));
</script>