Question

我这样做但它不起作用：

function timer(func){
   //Timer code here
   ...
   func();
}

function doSomething(){
   var param1;
   var param2;
   var execute = function(){
      alert(param1 + " - " +param2);
   };
}

var instance = new doSomething();
instance.param1 = "Hi";
instance.param2 = "Test";
timer(instance.execute);

为什么不是我的实例功能＆＃34;执行＆＃34;在定时器功能里面执行？我收到以下错误：Uncaught TypeError: func is not a function

什么是正确的方法？

Answer 1

你的代码中有很多错误，我认为这是你想要做的事情

      function timer(func){

           func();
        }

//       following your constructor  
        function doSomething(){
          var outer = this; //'this refer  to current object'
           this.execute = function(){
              alert (outer.param1 + " - " +outer.param2); // its a closure function  
           };

          return this;
        }

        var instance = new doSomething();
        instance.param1 = "Hi";
        instance.param2 = "Test";
        timer(instance.execute);

Javascript - 正确创建对象并作为参数传递的方法

1 个答案: