判断数据类型

function getDataType(data){
    var typeObj = {
        ‘[object Undefined]‘: "undefined",
        ‘[object Null]‘: "null",
        ‘[object Boolean]‘: "boolean",
        ‘[object Number]‘: "number",
        ‘[object String]‘: "string",
        ‘[object Object]‘: "object",
        ‘[object Array]‘: "array",
        ‘[object Function]‘: "function",
        ‘[object Date]‘: "date",
        ‘[object RegExp]‘: "regexp",
        ‘[object Error]‘: "error",
        ‘[object Arguments]‘: "arguments"
    }
    return typeof data !== "object" ? typeof data : toType[toString.call(data)];
}// 由于typeof []的值为"object", typeof {}的值也为"object", 所以需要增加判断。