<html><body><h1>JavaScript constructor 属性</h1><p>constructor 属性返回变量或对象的构造函数。</p><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>