Javascript 使用变量在循环中调用addEventListener
我是JavaScript新手。我有6个元素,我想配备非常类似的事件侦听器。我有一个可行的蛮力解决方案,我想要改进,但是(我认为)我在Java脚本闭包方面遇到了问题 工作代码:Javascript 使用变量在循环中调用addEventListener,javascript,javascript-events,addeventlistener,Javascript,Javascript Events,Addeventlistener,我是JavaScript新手。我有6个元素,我想配备非常类似的事件侦听器。我有一个可行的蛮力解决方案,我想要改进,但是(我认为)我在Java脚本闭包方面遇到了问题 工作代码: elem = document.getElementById("court1button"); elem.addEventListener("click", wassern_id1, false); elem = document.getElementById("court1xbutton"); elem.
elem = document.getElementById("court1button");
elem.addEventListener("click", wassern_id1, false);
elem = document.getElementById("court1xbutton");
elem.addEventListener("click", abbrechen_id1, false);
elem = document.getElementById("court2button");
elem.addEventListener("click", wassern_id2, false);
elem = document.getElementById("court2xbutton");
elem.addEventListener("click", abbrechen_id2, false);
... 4 more times ...
function wassern_id1(event) {
wassern(1, event)
}
function wassern_id2(event) {
wassern(2, event)
}
... 4 more times ...
function abbrechen_id1(event) {
abbrechen(1, event)
}
function abbrechen_id2(event) {
abbrechen(2, event)
}
... 4 more times ...
function wassern(id, event) { ...
function abbrechen(id, event) { ...
当我发现并理解了为什么它不能工作时,我发现一个简单的循环不起作用。然后我想到了下面的代码,它也不起作用,但现在我不再理解为什么它不起作用了。有人能给我解释一下并帮我创建工作代码吗
for (var id = 1; id <= 6; id++) {
elem = document.getElementById("court" + id + "button");
elem.addEventListener(
"click",
function(id2, event2){
wassern(id2, event2);
}(id, event),
false
);
elem = document.getElementById("court" + id + "xbutton");
elem.addEventListener(
"click",
function(id2, event2){
abbrechen(id2, event2);
}(id, event),
false
);
}
您需要将事件监听器机制放在闭包中,在外行闭包中,从内部函数返回值,您希望即使在执行循环或完成作用域之后,事件监听器也应该存在 您需要将整个事件或
getElementByid
包装在闭包中,下面是代码片段
for (var id = 1; id <= 2; id++) {
(function(id){
elem = document.getElementById("court" + id + "button");
elem.addEventListener(
"click",
function(event){wassern(id, event);},
false
);
elem = document.getElementById("court" + id + "xbutton");
elem.addEventListener(
"click",
function(event){abbrechen(id, event);},
false
);
})(id)
}
for(var id=1;id)您能否将示例代码添加到JS Fiddle中,以便人们可以帮助您更简单?通过一个示例更简单。@KyleMuir:请参阅yashprits的讨论,该JS Fiddle的答案传递到实际的MouseeEvent。如果您将答案编辑为包含该内容,我可以接受它。
for (var id = 1; id <= 2; id++) {
(function(id){
elem = document.getElementById("court" + id + "button");
elem.addEventListener(
"click",
function(event){wassern(id, event);},
false
);
elem = document.getElementById("court" + id + "xbutton");
elem.addEventListener(
"click",
function(event){abbrechen(id, event);},
false
);
})(id)
}