element.addEventListener(event, function, useCapture)
useCapture 可选。布尔值，指定事件是否在捕获或冒泡阶段执行。
document.getElementById("con").addEventListener('click', function (e) {
xy = getXY(e);
if (xy === null)
return;
r = xy + "-" + 1;
console.log(r);
});
document.getElementById("con").addEventListener('dblclick', function (e) {
xy = getXY(e);
if (xy === null)
return;
r = xy + "-" + 3;
console.log(r);
});
document.getElementById("con").addEventListener('auxclick', function (e) {
xy = getXY(e);
if (xy === null)
return;
r = xy + "-" + 5;
console.log(r);
});
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