constructor 属性

    返回所有JavaScript 变量的构造器函数

"Bill".constructor                 // 返回 "function String()  { [native code] }"
(3.14).constructor                 // 返回 "function Number()  { [native code] }"
false.constructor                  // 返回 "function Boolean() { [native code] }"
[1,2,3,4].constructor              // 返回 "function Array()   { [native code] }"
{name:'Bill', age:62}.constructor  // 返回" function Object()  { [native code] }"
new Date().constructor             // 返回 "function Date()    { [native code] }"
function () {}.constructor         // 返回 "function Function(){ [native code] }"

 

function isArray(myArray) {
    return myArray.constructor.toString().indexOf("Array") > -1;
}

 

或者更简单，检查对象是否是数组函数

function isArray(myArray) {
    return myArray.constructor === Array;
}