这是一个完整的，独立的示例。首先，使用以下HTML：
<canvas id="example" width="200" height="60"></canvas><div id="status"></div>
相关的Javascript：
// set up some sample squaresvar example = document.getElementById('example');var context = example.getContext('2d');context.fillStyle = "rgb(255,0,0)";context.fillRect(0, 0, 50, 50);context.fillStyle = "rgb(0,0,255)";context.fillRect(55, 0, 50, 50);$('#example').mousemove(function(e) { var pos = findPos(this); var x = e.pageX - pos.x; var y = e.pageY - pos.y; var coord = "x=" + x + ", y=" + y; var c = this.getContext('2d'); var p = c.getImageData(x, y, 1, 1).data; var hex = "#" + ("000000" + rgbToHex(p[0], p[1], p[2])).slice(-6); $('#status').html(coord + "<br>" + hex);});上面的代码假定存在jQuery和以下实用程序功能：
function findPos(obj) { var curleft = 0, curtop = 0; if (obj.offsetParent) { do { curleft += obj.offsetLeft; curtop += obj.offsetTop; } while (obj = obj.offsetParent); return { x: curleft, y: curtop }; } return undefined;}function rgbToHex(r, g, b) { if (r > 255 || g > 255 || b > 255) throw "Invalid color component"; return ((r << 16) | (g << 8) | b).toString(16);}// set up some sample squaresvar example = document.getElementById('example');var context = example.getContext('2d');context.fillStyle = "rgb(255,0,0)";context.fillRect(0, 0, 50, 50);context.fillStyle = "rgb(0,0,255)";context.fillRect(55, 0, 50, 50);$('#example').mousemove(function(e) { var pos = findPos(this); var x = e.pageX - pos.x; var y = e.pageY - pos.y; var coord = "x=" + x + ", y=" + y; var c = this.getContext('2d'); var p = c.getImageData(x, y, 1, 1).data; var hex = "#" + ("000000" + rgbToHex(p[0], p[1], p[2])).slice(-6); $('#status').html(coord + "<br>" + hex);});function findPos(obj) { var curleft = 0, curtop = 0; if (obj.offsetParent) { do { curleft += obj.offsetLeft; curtop += obj.offsetTop; } while (obj = obj.offsetParent); return { x: curleft, y: curtop }; } return undefined;}function rgbToHex(r, g, b) { if (r > 255 || g > 255 || b > 255) throw "Invalid color component"; return ((r << 16) | (g << 8) | b).toString(16);}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script><canvas id="example" width="200" height="60"></canvas><div id="status"></div>
