var number = 10; 
console.log("Number" === number.constructor);

var string = "str";
console.log("String" === string.constructor);

var boolean = true;
console.log("Boolean" === boolean.constructor);

var object = {};
console.log("Object" === object.constructor);

var func = function () {};
console.log("Function" === func.constructor);

var array = [];
console.log("Array" === array.constructor);

var date = getDate();
console.log("Date" === date.constructor);

var regexp = getRegExp();
console.log("RegExp" === regexp.constructor);

另外使用typeof可以部分判断

var number = 10; 
var boolean = true;
var object = {};
var func = function () {};
var array = [];
var date = getDate();
var regexp = getRegExp();

console.log("number" === typeof number);
console.log("boolean" === typeof boolean);
console.log("object" === typeof object);
console.log("function" === typeof func);
console.log("object" === typeof array);
console.log("object" === typeof date);
console.log("object" === typeof regexp);

console.log("undefined" === typeof undefined);
console.log("object" === typeof null);

Date 和 RegExp

sjs 不支持 new 关键字（new 运算），所以无法通过以下方式创建 date 和 regexp 类型

new Date(); 
new RegExp("/d+/");

需要通过getDate和getRegExp方法获取

getDate(); 
getDate(milliseconds);
getDate(datestring);
getDate(year, month[, date[, hours[, minutes[, seconds[, milliseconds]]]]]);

getRegExp(pattern[, flags]);

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数据类型判断

Date 和 RegExp

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