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2.html
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2.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
function windowTocanvas(canvas, x, y) {
var bbox = canvas.getBoundingClientRect();
return {
x: x - bbox.left * (canvas.width / bbox.width),
y: y - bbox.top * (canvas.height / bbox.height)
};
}
window.onload=function(){
var canvas=document.getElementById("myCanvas");
canvas.onclick=function(event){
var loc=windowTocanvas(canvas,event.clientX,event.clientY)
var x=parseInt(loc.x);
var y=parseInt(loc.y);
document.getElementById("input_window").value=event.clientX+"--"+event.clientY;
document.getElementById("input_canvas").value=x+"--"+y;
}
}
</script>
</head>
<body>
<div class="" align="center"style="position: absolute; z-index: 1; top: 100px; left: 100px;">
<canvas id="myCanvas" style="border: 1px solid #000000;" height="300px" width="600px">
</canvas>
</div>
<div class=""align="center"style="position: absolute; z-index: 1; top: 30px; left: 100px;">
点击获取窗口的X，Y值：<input type="text" id="input_window" value="" /> <br />
点击获取canvas的X，Y值：<input type="text" id="input_canvas" value="" />
</div>
</body>
</html>