javascript - 在 for 循环内调用对象的函数 - JavaScript

Question

我有一个名为 foo 的对象:

function Foo(){
  this.conceal = function(){ ... };
};

还有一个名为 toggleView 的方法，它迭代 foo 的集合并在每个实例上调用 conceal() 方法:

function toggleView(foos){
  for(a in foos){
    foos[a].conceal();
  }
}

当然，foos[a].conceal(); 返回:conceal 不是函数

Answer 1

function Foo(){
  this.conceal = function( item ) { 
    console.log(item); // "a" "b" "c"
  };
};

function toggleView(foos) {
  var myFoo = new Foo();      // Create new instance (here or outside this fn)
  for(a in foos){
    myFoo.conceal(foos[a]);   // use your instance and pass as items arg. reference
  }
}

toggleView(["a","b","c"]);

将 toggleView 设为 Foo 的原型(prototype)的示例

function Foo(){
  this.conceal = function( item ) { 
    console.log(item); // "a" "b" "c"
  };
}

Foo.prototype.toggleView = function(foos) {
  for(a in foos){
    this.conceal(foos[a]);        // invoke .conceal Method using `this` reference
  }
}

var myFoo = new Foo();            // Create new instance
myFoo.toggleView(["a","b","c"]);