标签：txt type black event 获取 mat eve math function
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<title>Document</title>
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canvas{ border: 1px solid black; }
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<canvas id="myCanvas" width="500" height="500"></canvas>
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var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
ctx.font = "16px Arial";
canvas.addEventListener("mousemove", function(e) {
var cRect = canvas.getBoundingClientRect();
var canvasX = Math.round(e.clientX - cRect.left);
var canvasY = Math.round(e.clientY - cRect.top);
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillText("X: "+canvasX+", Y: "+canvasY, 10, 20);
});
</script>
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</html>标签：txt type black event 获取 mat eve math function
原文地址：https://www.cnblogs.com/ye-hcj/p/10356376.html
