js 全半角转换

/*
 *全角空格为12288，半角空格为32
 *其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
 */

function SBC(text) {
    return text.replace(/[x20-x7e]/g, function($) {
        return $ == " " ? "u3000" : String.fromCharCode($.charCodeAt(0) + 0xfee0);
    });
}
var toDBC=function(input) {//to DBC case
    var res="",c;
    for(var i=0;i< input.length;i++) {
        c=input.charCodeAt(i);
        if(c >=0xFF01 && c <=0xFF5E)// 65281 65374
            res+=String.fromCharCode(c-0xFEE0);//65248
        else if(c==0x3000)//12288
            res+=String.fromCharCode(0x20);//32
        else
            res+=input.charAt(i);
    }
    return res;
}
var toSBC=function(input) {//to SBC case
    var res="",c;
    for(var i=0; i < input.length;i++) {
        c=input.charCodeAt(i);
        if(c>=0x21 && c<=0x7e)//33 126
            res+=String.fromCharCode(c+0xFEE0);
        else if(c==0x20)
            res += String.fromCharCode(0x3000);
        else
            res += input.charAt(i);
    }
    return res;
}
var s="，哦哦，hello　ｓｓｓｓ！＃～";
var s1=toDBC(s);
var s2=toSBC(s1);
alert("原字符："+s+"nntoDBC："+s1+"nntoSBC："+s2);