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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title>canvas实现跟随鼠标旋转的箭头</title>
<style>
*{padding: 0;margin: 0}
</style>
</head>
<body>
<canvas width="500" height="500" style="border: 1px solid #555; display: block;margin: 0 auto;"></canvas>
<script>
var arrow=function () {
this.x=0;
this.y=0;
this.color="#f90"
this.rolation=0;
}
var canvas=document.querySelector(‘canvas’)
var ctx=canvas.getContext(‘2d’);
arrow.prototype.draw=function (ctx) {
ctx.save();
ctx.translate(this.x,this.y);
ctx.rotate(this.rolation)
ctx.fillStyle=this.color;
ctx.beginPath();
ctx.moveTo(0, 15);
ctx.lineTo(-50, 15);
ctx.lineTo(-50, -15);
ctx.lineTo(0,-15);
ctx.lineTo(0,-35);
