擦除效果
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
body{
text-align:center;
padding-top:100px;
}
</style>
</head>
<body>
<canvas></canvas>
<script>
var canvas=document.getElementsByTagName("canvas")[0];
canvas.width=600;
canvas.height=600;
canvas.style.background="skyblue";
var cxt=canvas.getContext("2d");
canvas.onmousedown=function(event){
event=event||window.event;
var x=event.clientX-this.offsetLeft;
var y=event.clientY-this.offsetTop;
canvas.onmousemove=function(e){
var e=e||window.event;
cxt.strokeStyle="#fff";
cxt.strokeRect(x,y,e.clientX-this.offsetLeft-x,e.clientY-this.offsetTop-y);
cxt.fillStyle="white";
cxt.fillRect(x,y,e.clientX-this.offsetLeft-x,e.clientY-this.offsetTop-y);
}
document.onmouseup=function(){
canvas.onmousemove=null;
}
}
</script>
</body>
</html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
body{
text-align:center;
padding-top:100px;
}
</style>
</head>
<body>
<canvas></canvas>
<script>
var canvas=document.getElementsByTagName("canvas")[0];
canvas.width=600;
canvas.height=600;
canvas.style.background="skyblue";
var cxt=canvas.getContext("2d");
canvas.onmousedown=function(event){
event=event||window.event;
var x=event.clientX-this.offsetLeft;
var y=event.clientY-this.offsetTop;
canvas.onmousemove=function(e){
var e=e||window.event;
cxt.strokeStyle="#fff";
cxt.strokeRect(x,y,e.clientX-this.offsetLeft-x,e.clientY-this.offsetTop-y);
cxt.fillStyle="white";
cxt.fillRect(x,y,e.clientX-this.offsetLeft-x,e.clientY-this.offsetTop-y);
}
document.onmouseup=function(){
canvas.onmousemove=null;
}
}
</script>
</body>
</html>
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