如何检测鼠标中键点击？

您必须检测事件2

event = event || window.event; //make sure to pass the event into the function
if (event.which == 2) {
    //do code..
}

下面的代码可以帮到你。它可以检测用户单击了哪个鼠标按钮。 用于中间按钮。e.which == 2

<script type="text/javascript">

function detect_button(e){  
    e = e || window.event;

    if (e.which == null){
        button = (e.button < 2) ? 'left' : ((e.button == 4) ? 'middle' : 'right');
    }
    else{
        button = (e.which < 2) ? 'left' : ((e.which == 2) ? 'middle' : 'right');
    }

    alert(button);
}

</script>

OnClick 不依赖于鼠标，而是更多地依赖于目标元素本身。

以下是检测元素是否处于中键点击状态的方法：

document.body.onclick = function (e) {
  if (e && (e.which == 2 || e.button == 4 )) {
    console.log('middleclicked')
  }
}

你必须使用已经内置在 DOM 和 Javascript 引擎中的东西，然后放入浏览器不同的情况下（这就是通常使用 jQuery 的原因）。

document.getElementById("myBtn").onclick = function(event) {
    event = event || window.event

    // Now event is the event object in all browsers.

    // Note: event.target - the reference to clicked element. IE uses event.srcElement
    // In W3C there is a button property which works same in all browsers except IE:
    // 0 - left button, 1 - middle button, 2 - right button
    // For IE, left button = button & 1 (the 1st bit) is set to 1
    // right button = button & 2 (the 2nd bit) is 1
    // and middle button = button & 4 (the 3rd bit)
    var left = event.button == 0 || 1 == event.button&1;
    var middle = event.button == 1 || 1 == event.button&2;
    var right = event.button == 2 || 1 == event.button&3;

    // Put your code here
}

已经在这里的答案/解决方案可能对其他人有效，但对我不起作用。 所以我的解决方案是：我不使用事件，而是使用事件clickmousedown

window.onmousedown = (event) => {
    if (event.button == 1 || event.buttons == 4) {
        console.log('middle mouse');
    }
}

或

window.addEventListener('mousedown', (event) => {
   if (event.button == 1 || event.buttons == 4) {
      console.log('middle mouse');
   }
});