html5在线制作教程,html5教程制作简单画板代码分享

HTML5制作简单画板

复制代码

代码如下:

http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js">>

canvas{ border:2px solid #000;}

$(document).ready(function(){

var canvas=document.getElementById("draw");

var draw=canvas.getContext("2d");

draw.lineWidth=5; //线条粗细

draw.strokeStyle="red"; //颜色

var godraw=false;

//按下鼠标

$("#draw").mousedown(function(e){

//准确坐标

var mouseX=e.pageX-this.offsetLeft;

var mouseY=e.pageY-this.offsetTop;

draw.moveTo(mouseX,mouseY);

godraw=true;

})

//放开鼠标

$("#draw").mouseup(function(e){

godraw=false;

})

//移动鼠标

$("#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();

}

})

})