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我正在尝试创建一个按钮，可以将“双击”切换为“单击”，反之亦然。出于某种原因，一旦切换到单击，就无法切换回来。有人可以帮忙吗？

function init() {
    normal_listeners();
}

function addListener(){
    var image1 = document.getElementById('image_1');
    var image2 = document.getElementById('image_2');
    var image3 = document.getElementById('image_3');

    if(document.getElementById('listener_1').value == "Listener"){
        document.getElementById('listener_1').style.backgroundColor = "red";
        alert("Normal");

        image1.addEventListener("dblclick", function(){userChoice(1);}, false);
        image2.addEventListener("dblclick", function(){userChoice(2);}, false);
        image3.addEventListener("dblclick", function(){userChoice(3);}, false); 

        document.getElementById('listener_1').value = "Normal";
    } 
    else if(document.getElementById('listener_1').value == "Normal") {
        document.getElementById('listener_1').style.backgroundColor = "green";
        alert("Listener");

        image1.addEventListener("click", function(){userChoice(1);}, false);
        image2.addEventListener("click", function(){userChoice(2);}, false);
        image3.addEventListener("click", function(){userChoice(3);}, false);

       document.getElementById('listener_1').value = "Listener";
   }
}

function normal_listeners(){
    var image1 = document.getElementById('image_1');
    var image2 = document.getElementById('image_2');
    var image3 = document.getElementById('image_3');
    var listener1 = document.getElementById('listener_1');

    listener1.addEventListener("click", addListener, false);    
    image1.addEventListener("dblclick", function(){userChoice(1);}, false);
    image2.addEventListener("dblclick", function(){userChoice(2);}, false);
    image3.addEventListener("dblclick", function(){userChoice(3);}, false);
 }
 window.onload = init;

 <img id="image_1" src="rock.jpg" alt="ROCK" width="100" height="100">
 <img id="image_2" src="paper.jpg" alt="PAPER" width="100" height="100">
 <img id="image_3" src="scissors.jpg" alt="SCISSORS" width="100" height="100">
 <input type="button" id="listener_1" value="Normal" style="background-color:red">
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1 回答 1

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我认为您必须在添加新事件侦听器之前删除事件侦听器。分配的单击侦听器可能会阻止双击侦听器的发生。

于 2013-07-03T11:04:34.307 回答