将作为参数传递的“子”函数包装在函数包装器中，以防止在调用“父”函数时计算它们。

function outcome(){
    return false;
}

function process(callbackSuccess, callbackFailure){
    if ( outcome() )
        callbackSuccess();
    else
        callbackFailure();
}

process(function(){alert("OKAY");},function(){alert("OOPS");})

带有任意数量参数和回调上下文的问题的代码:

function SomeFunction(name) {
    this.name = name;
}
function tryMe(param1, param2) {
    console.log(this.name + ":  " + param1 + " and " + param2);
}
function tryMeMore(param1, param2, param3) {
    console.log(this.name + ": " + param1 + " and " + param2 + " and even " + param3);
}
function callbackTester(callback, callbackContext) {
    callback.apply(callbackContext, Array.prototype.splice.call(arguments, 2));
}
callbackTester(tryMe, new SomeFunction("context1"), "hello", "goodbye");
callbackTester(tryMeMore, new SomeFunction("context2"), "hello", "goodbye", "hasta la vista");

// context1: hello and goodbye
// context2: hello and goodbye and even hasta la vista

将作为参数传递的“子”函数包装在函数包装器中，以防止在调用“父”函数时计算它们。

function outcome(){
    return false;
}

function process(callbackSuccess, callbackFailure){
    if ( outcome() )
        callbackSuccess();
    else
        callbackFailure();
}

process(function(){alert("OKAY");},function(){alert("OOPS");})

当你有一个回调函数，它将被你的代码以外的东西调用，具有特定数量的参数，你想传递额外的参数，你可以传递一个包装器函数作为回调，并在包装器内部传递额外的参数。

function login(accessedViaPopup) {
    //pass FB.login a call back function wrapper that will accept the
    //response param and then call my "real" callback with the additional param
    FB.login(function(response){
        fb_login_callback(response,accessedViaPopup);
    });
}

//handles respone from fb login call
function fb_login_callback(response, accessedViaPopup) {
    //do stuff
}

这也可以:

回调函数 函数tryMe（param1， param2） { 警报（参数 1 + “ 和 ” + 参数 2）; } 回调执行器 函数回调测试器（回调） { 回调（）; } 测试功能 callbackTester（function（） { tryMe（“hello”，“goodbye”）; });

另一个场景:

// callback function function tryMe(param1, param2, param3) { alert(param1 + " and " + param2 + " " + param3); } // callback executer function callbackTester(callback) { //this is the more obivous scenario as we use callback function //only when we have some missing value //get this data from ajax or compute var extraParam = "this data was missing"; //call the callback when we have the data callback(extraParam); } // test function callbackTester(function(k) { tryMe("hello", "goodbye", k); });

在这个简单的例子中使用curry函数。

const BTN = document.querySelector('button') const RES = document.querySelector('p') const changeText = newText => () => { RES.textContent = newText ｝ BTN。addEventListener(“点击”,changeText(点击!)) <按钮> ClickMe > < /按钮 < p >不点击< p >