如果在javaScript中有条件就可以运行！ [英] do function if condition in javaScript !

问题描述

我在javaScript中有两个函数！

喜欢这些：

I have two function in javaScript !
like these :

function first()
{
var a= 10;
}

function second()
{
//when a=10 run this function
}

我有一个按钮就可以了：

and i have a button loke this:

<button>Button</button>

现在我的问题：

我想要第二个功能延迟，当a = 10运行时！

我怎么能这样做？

now my problem :
I want the second function delay and when a=10 run it !
How i can do this ?

推荐答案

每次发生更改时都会调用第一个函数，然后检查值一个。这样的东西，

You would be calling the first function each time the change occurs, and then check against the value of a. Something like this,

function first()
{
  var a=10;
  // value will always be 10 if you assign it like above
  if(a == 10) {
    // trigger the second function
    second();
  }
}

..要点击按钮执行第一个功能，你可以写 onclick HTML中的事件，

.. to execute the first function on the button click, you can write the onclick event in the HTML as,

<button onclick="first()">Button</button>

您知道吗，您可以直接将HTML标记中的值作为参数传递给JavaScript吗？

Did you know, you can directly pass the value from HTML markup to the JavaScript as a parameter too?

<button onclick="first(10)">Button</button>

// a is the parameter; with 10 as value
function first(a) {
   // this is the body of the function..
   if(a == 10) {
      // execute the second function...
      second();
   }
}

从你的简短问题我明白你想要一个定时器延迟？或者是'一个'输入？这是一个定时的延迟，其中10 =秒这样做

from your brief question i understand you want a timer delay? or is 'a' an input? its its a timed delay where 10 = seconds do like this

function first(){

    var second = function(){
    alert("hello world");
    }
    //will start a timer and then run second() after 10secs
    window.setTimeout(second, 10000);
}

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