嘿，这是在dojo，只是因为它是我已经在一个项目的代码。

如何将其转换回非dojo的普通JavaScript应该是相当明显的。

  function onMouseClick(e) {
      var x = e.clientX;
      var y = e.clientY;
  }
  var canvas = dojo.byId(canvasId);
  dojo.connect(canvas,"click",onMouseClick);

希望这能有所帮助。

Edit 2018:这个答案很老了，它使用检查不再需要的旧浏览器，因为clientX和clienti属性在所有当前的浏览器中都有效。您可能想要查看Patriques Answer，以获得一个更简单、更近期的解决方案。

最初的回答: 正如我当时发现的一篇文章所描述的那样，但现在已经不存在了:

var x;
var y;
if (e.pageX || e.pageY) { 
  x = e.pageX;
  y = e.pageY;
}
else { 
  x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft; 
  y = e.clientY + document.body.scrollTop + document.documentElement.scrollTop; 
} 
x -= gCanvasElement.offsetLeft;
y -= gCanvasElement.offsetTop;

对我来说效果很好。

这里是一个简化的解决方案(这并不适用于边框/滚动):

function click(event) {
    const bound = event.target.getBoundingClientRect();

    const xMult = bound.width / can.width;
    const yMult = bound.height / can.height;

    return {
        x: Math.floor(event.offsetX / xMult),
        y: Math.floor(event.offsetY / yMult),
    };
}

这是一个非常好的教程-

http://www.html5canvastutorials.com/advanced/html5-canvas-mouse-coordinates/

 <canvas id="myCanvas" width="578" height="200"></canvas>
<script>
  function writeMessage(canvas, message) {
    var context = canvas.getContext('2d');
    context.clearRect(0, 0, canvas.width, canvas.height);
    context.font = '18pt Calibri';
    context.fillStyle = 'black';
    context.fillText(message, 10, 25);
  }
  function getMousePos(canvas, evt) {
    var rect = canvas.getBoundingClientRect();
    return {
      x: evt.clientX - rect.left,
      y: evt.clientY - rect.top
    };
  }
  var canvas = document.getElementById('myCanvas');
  var context = canvas.getContext('2d');

  canvas.addEventListener('mousemove', function(evt) {
    var mousePos = getMousePos(canvas, evt);
    var message = 'Mouse position: ' + mousePos.x + ',' + mousePos.y;
    writeMessage(canvas, message);
  }, false);

希望这能有所帮助!

我推荐这个链接 http://miloq.blogspot.in/2011/05/coordinates-mouse-click-canvas.html

<style type="text/css">

  #canvas{background-color: #000;}

</style>

<script type="text/javascript">

  document.addEventListener("DOMContentLoaded", init, false);

  function init()
  {
    var canvas = document.getElementById("canvas");
    canvas.addEventListener("mousedown", getPosition, false);
  }

  function getPosition(event)
  {
    var x = new Number();
    var y = new Number();
    var canvas = document.getElementById("canvas");

    if (event.x != undefined && event.y != undefined)
    {
      x = event.x;
      y = event.y;
    }
    else // Firefox method to get the position
    {
      x = event.clientX + document.body.scrollLeft +
          document.documentElement.scrollLeft;
      y = event.clientY + document.body.scrollTop +
          document.documentElement.scrollTop;
    }

    x -= canvas.offsetLeft;
    y -= canvas.offsetTop;

    alert("x: " + x + "  y: " + y);
  }

</script>

下面是对Ryan Artecona关于画布宽度可变(%)的答案的一个小修改:

 HTMLCanvasElement.prototype.relMouseCoords = function (event) {
    var totalOffsetX = 0;
    var totalOffsetY = 0;
    var canvasX = 0;
    var canvasY = 0;
    var currentElement = this;

    do {
        totalOffsetX += currentElement.offsetLeft;
        totalOffsetY += currentElement.offsetTop;
    }
    while (currentElement = currentElement.offsetParent)

    canvasX = event.pageX - totalOffsetX;
    canvasY = event.pageY - totalOffsetY;

    // Fix for variable canvas width
    canvasX = Math.round( canvasX * (this.width / this.offsetWidth) );
    canvasY = Math.round( canvasY * (this.height / this.offsetHeight) );

    return {x:canvasX, y:canvasY}
}