var hasChinese = function(val) {
    var patterns = {
        japanese: /[\u0800-\u4E00]/,
        chinese: /[\u4E00-\u9fa5]/,
        korean: /[\u9fa5-\uFFFF]/,
        threeBytes: /[\u0080-\uFFFF]/,
        fullWidthSymbol: /[\uFF00-\uFFFF]/,
        fullWidthCharNumber: /[\uFE30-\uFFA0]/,
        fullWithAll: /[^\uFF00-\uFFFF]/,
        fullWithAll2: /[^\x00-\xff]/
    }; 
    return patterns.chinese.test(val);
}

var toASCII = function(chars) {
    var ascii = '';
    for(var i=0, l=chars.length; i<l; i++) {
        var c = chars[i].charCodeAt(0);
        if (c >= 0xFF00 && c <= 0xFFEF) {
            c = 0xFF & (c + 0x20);
        }
        ascii += String.fromCharCode(c);
    }
    return ascii;
}

// example
toASCII("ＡＢＣ"); // returns 'ABC' 0x41