如何在自己内部调用函数

I have a function that I want to call again inside, after the last line finishes.

我有一个函数,我想在最后一行结束后再次调用。

Maybe it will be more understandable if I show code.

如果我展示代码,也许会更容易理解。

function updateQuantity(){ 
    // further code where I change same data
    // and now I want to start function again but with remembering the input element that called it previously 
    updateQuantity(this);  // I tried it this way but it doesn't work
}

Any idea?

3 个解决方案

#1

From the comments to your question, it seems like you want to pass a value to your recursive method call.

从评论到您的问题,您似乎想要将值传递给递归方法调用。

function updateQuantity(val){
  // Do something with `val`
  val = val + 1;

  console.log(val);

  // And call it again with the value
  if(val < 5){
    updateQuantity(val);
  }
}

updateQuantity(1); // 2, 3, 4, 5

#2

The answer is simple, it is enough to use updateQuantity.call(this) inside the updateQuantity function - when we use call and add this, the function will start again and remember the input element that previously called updateQuantity.

答案很简单,在updateQuantity函数中使用updateQuantity.call(this)就足够了 - 当我们使用call并添加它时,该函数将重新启动并记住之前调用updateQuantity的输入元素。

#3

it looks like you are trying to get that DOM element in the function body.

看起来你正试图在函数体中获取DOM元素。

this is a simple example.

这是一个简单的例子。

link to Fiddle https://jsfiddle.net/c3kbu0j7/10/

链接到Fiddle https://jsfiddle.net/c3kbu0j7/10/

html

<a href="#">element you want.</a>

javasript

$('a').on('click',function(){
    a(this);
});
var i=0;
function a(tar){
  console.log(tar);
  if(i<4){
    i++;
    a(tar);
  }
  i=0;
}

#1