JavaScript：将参数传递给回调函数 [英] JavaScript: Passing parameters to a callback function

问题描述

 函数tryMe （param1，param2）{
 alert（param1 +和+ param2）; 
} 
 
 function callbackTester（callback，param1，param2）{
 callback（param1，param2）; 
} 
 
 callbackTester（tryMe，hello，goodbye）; 
  

解决方案

参数变量如下：

  function tryMe（param1，param2）{
 alert（param1 + param2）; 
} 
 
 function callbackTester（callback）{
 callback（arguments [1]，arguments [2]）; 
} 
 
 callbackTester（tryMe，hello，goodbye）; 
  

但是否则，你的示例工作正常（arguments [0]可以用来代替callback测试者）

I'm trying to pass some parameter to a function used as callback, how can I do that?

function tryMe (param1, param2) {
    alert (param1 + " and " + param2);
}

function callbackTester (callback, param1, param2) {
    callback (param1, param2);
}

callbackTester (tryMe, "hello", "goodbye");

解决方案

If you want something slightly more general, you can use the arguments variable like so:

function tryMe (param1, param2) {
    alert(param1 + " and " + param2);
}

function callbackTester (callback) {
    callback (arguments[1], arguments[2]);
}

callbackTester (tryMe, "hello", "goodbye");

But otherwise, your example works fine (arguments[0] can be used in place of callback in the tester)

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