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<!DOCTYPE HTML> <html lang="en-US"> <head> <title></title> <meta charset="UTF-8"> <script src="<a href="http://ajax./ajax/libs/jquery/1.7.1/jquery.min.js"></script">http://ajax./ajax/libs/jquery/1.7.1/jquery.min.js"></script</a>> </head> <style> canvas{ border:2px solid #000;} </style> <body> <canvas id="draw" width="500" height="500"></canvas> <script type="text/javascript"> $(document).ready(function(){ var canvas=document.getElementById("draw"); var draw=canvas.getContext("2d"); draw.lineWidth=5; //線條粗細(xì) draw.strokeStyle="red"; //顏色 var godraw=false; //按下鼠標(biāo) $("#draw").mousedown(function(e){ //準(zhǔn)確坐標(biāo) var mouseX=e.pageX-this.offsetLeft; var mouseY=e.pageY-this.offsetTop; draw.moveTo(mouseX,mouseY); godraw=true;</p> <p> }) //放開鼠標(biāo) $("#draw").mouseup(function(e){ godraw=false; }) //移動鼠標(biāo) $("#draw").mousemove(function(e){ if(godraw){ var mouseX=e.pageX-this.offsetLeft; var mouseY=e.pageY-this.offsetTop; draw.lineTo(mouseX+4,mouseY+4); draw.stroke(); }</p> <p> }) }) </script> </body> </html> |
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