JavaScript之判断参数的数值的详细类型

//判断是否为字符串
//返回类型：
//{baseType:typeof(arg),numberType:'int','float',-1}
function numberType(arg){
    var baseType;
    var numberType;
    var regx_int =  /^[0-9]*[1-9][0-9]*$/;
    if(!isNaN(arg)){//JavaScript中，属于数值的有：数值型字符串和真实数值
        baseType = typeof(arg);//输出：string or number
        if(regx_int.test(arg)){//整数
            numberType = "int";
        } else {
            numberType = "float";
        }
    } else {
        baseType = typeof(arg);
        numberType = -1;
    }

    return {
        "arg":arg,
        "baseType": baseType,//注意：typeof(stringNumber):string
        "numberType": numberType
    }
}

/*
    console.log(numberType("23"));  //{arg: "23", baseType: "string", numberType: "int"}
    console.log(numberType("23.0"));//{arg: "23.0", baseType: "string", numberType: "float"}
    console.log(numberType("23a")); //{arg: "23a", baseType: "string", numberType: -1}
    console.log(numberType(23));    //{arg: 23, baseType: "number", numberType: "int"}
    console.log(numberType(23.0));  //{arg: 23, baseType: "number", numberType: "int"}
 */

参考文献：

　　http://blog.csdn.net/xingfeng0501/article/details/6681912