constructor 属性返回变量或对象的构造函数判断是否为日期，数组的例子
constructor 属性返回变量或对象的构造函数。<!DOCTYPE html><html><head><meta charset="utf-8"><title>constructor 属性返回变量或对象的构造函数。</title></head><body><p id="demo"></p><script>document.getElementById("demo").innerHTML ="john".constructor + "<br>" +(3.14).constructor + "<br>" +false.constructor + "<br>" +[1,2,3,4].constructor + "<br>" +{name:'john', age:34}.constructor + "<br>" +new Date().constructor + "<br>" +function () {}.constructor;</script></body></html>运行结果：function String() { [native code] }function Number() { [native code] }function Boolean() { [native code] }function Array() { [native code] }function Object() { [native code] }function Date() { [native code] }function Function() { [native code] } 判断是否为日期，数组的例子<!DOCTYPE html><html><head><meta charset="utf-8"><title>判断是否为日期、数组</title></head><body><p>判断是否为日期。</p><p id="demo1"></p><p>判断是否为数组。</p><p id="demo2"></p><script>var myDate = new Date();var fruits = ["Banana", "Orange", "Apple", "Mango"];document.getElementById("demo1").innerHTML = isDate(myDate);document.getElementById("demo2").innerHTML = isArray(fruits);function isDate(myDate) {return myDate.constructor.toString().indexOf("Date") > -1;}function isArray(myArray) {return myArray.constructor.toString().indexOf("Array") > -1;}</script></body></html> 测试结果判断是否为日期。true判断是否为数组。true
