获取类的函数（方法） [英] Get functions (methods) of a class

问题描述

我必须动态地获取ES6类的属性和功能。这是甚么可能吗？

使用for ... in循环，我只能遍历一个类实例的属性：

  class Foo {
 constructor（）{
 this.bar =嗨; 
} 
 someFunc（）{
 console.log（this.bar）; 
} 
} 
 var foo = new Foo（）; 
 for（var idx in foo）{
 console.log（idx）; 
} 
  

输出：

  bar 
  

解决方案

该功能将获得所有功能。继承与否，无可否认。包括所有功能。

  function getAllFuncs（obj）{
 var props = []; 
 
 do {
 props = props.concat（Object.getOwnPropertyNames（obj））; 
} while（obj = Object.getPrototypeOf（obj））; 
 
 return props.sort（）。filter（function（e，i，arr）{
 if（e！= arr [i + 1]&& typeof obj [e] =='function'）return true; 
}）; 
} 
  

做测试

getAllFuncs（[1,3]）;

控制台输出：

  [constructor，toString，toLocaleString，join，pop push，concat，reverse，shift，unshift，slice，splice，sort，filter，forEach，some，every ，indexOf，lastOutProperty，isPrototypeOf，to， propertyIsEnumerable，__defineGetter__，__lookupGetter__，__defineSetter__，__lookupSetter__] 
  

I have to dynamically fetch the properties and functions of a ES6 class. Is this even possible?

Using a for...in loop, I only get to loop through the properties of a class instance:

class Foo {
  constructor() {
    this.bar = "hi";
  }
  someFunc() {
    console.log(this.bar);
  }
}
var foo = new Foo();
for (var idx in foo) {
  console.log(idx);
}

Output:

bar

解决方案

This function will get all functions. Inherited or not, enumerable or not. All functions are included.

function getAllFuncs(obj) {
    var props = [];

    do {
        props = props.concat(Object.getOwnPropertyNames(obj));
    } while (obj = Object.getPrototypeOf(obj));

    return props.sort().filter(function(e, i, arr) { 
       if (e!=arr[i+1] && typeof obj[e] == 'function') return true;
    });
}

Do test

getAllFuncs([1,3]);

console output:

["constructor", "toString", "toLocaleString", "join", "pop", "push", "concat", "reverse", "shift", "unshift", "slice", "splice", "sort", "filter", "forEach", "some", "every", "map", "indexOf", "lastIndexOf", "reduce", "reduceRight", "entries", "keys", "constructor", "toString", "toLocaleString", "valueOf", "hasOwnProperty", "isPrototypeOf", "propertyIsEnumerable", "__defineGetter__", "__lookupGetter__", "__defineSetter__", "__lookupSetter__"]

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