javascript - 如何获取JavaScript对象的类？(How to get a JavaScript object's class?)

Question

I created a JavaScript object, but how I can determine the class of that object?(我创建了一个JavaScript对象，但是如何确定该对象的类呢？)

I want something similar to Java's .getClass() method.(我想要类似于Java的.getClass()方法。)   ask by DNB5brims translate from so

Answer 1

There's no exact counterpart to Java's getClass() in JavaScript.(JavaScript中没有与Java的getClass()完全相同的对象。)

Mostly that's due to JavaScript being a prototype-based language , as opposed to Java being a class-based one.(大多数情况下，这是由于JavaScript是基于原型的语言 ，而不是Java是基于类的 语言 。) Depending on what you need getClass() for, there are several options in JavaScript:(根据您需要getClass()的不同，JavaScript中有几个选项：) typeof instanceof obj. constructor func. prototype , proto .(prototype ， proto 。) isPrototypeOf A few examples:(一些例子：) function Foo() {} var foo = new Foo(); typeof Foo; // == "function" typeof foo; // == "object" foo instanceof Foo; // == true foo.constructor.name; // == "Foo" Foo.name // == "Foo" Foo.prototype.isPrototypeOf(foo); // == true Foo.prototype.bar = function (x) {return x+x;}; foo.bar(21); // == 42 Note: if you are compiling your code with Uglify it will change non-global class names.(注意：如果使用Uglify编译代码，它将更改非全局类名。) To prevent this, Uglify has a --mangle param that you can set to false is using gulp or grunt .(为了防止这种情况，Uglify有一个--mangle参数，您可以使用gulp或grunt设置为false。)