前端之家收集整理的这篇文章主要介绍了
简易的canvas画图本，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
<table class="html5">@H_403_0@<tr class="li1">
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>
>
>
>画图板>
>
>
>
*{margin: 0; padding: 0;}
ul,ol{list-style: none;}
th,strong,var,em{font-weight: normal; font-style: normal;}
a{text-decoration: none;}
body{
width: 100%;
height: 100%;
}
.Box{
width: 800px;
height: 940px;
margin:0 auto;
}
#cvs{
background-color: #000;
}
#btn{
line-height: 30px;
font-size: 25px;
color: green;
height: 30px;
width: 120px;
cursor: pointer;
}
span{
height: 30px;
display: inline-block;
text-align: center;
font-size: 26px;
line-height: 30px;
color: #666;
}
#sb{
width: 170px;
text-align: left;
}
#color{
height: 30px;
/*margin-left: 20px;*/
}
#range{
width: 100px;
margin-left: 10px;
}
>
>
onselectstart>
Box">
>您的浏览器不支持canvas!>
>清空画板>
>颜色：>
>
>线条粗细：1>
>
>
><>
>
var cvs=document.getElementById('cvs');
var btn=document.getElementById('btn');
var setColor=document.getElementById('color');
var range=document.getElementById('range');
var sb=document.getElementById('sb');
var ctx=cvs.getContext('2d');
var x=0,y=0,color='',lineW=1;
cvs.onmousedown=function(e){
// console.log(1);
var e=e||window.event;
color=setColor.value;
console.log(setColor);
ctx.beginPath();
x=e.clientX-cvs.offsetLeft;
y=e.clientY-cvs.offsetTop;
ctx.moveTo(x,y);
document.onmousemove=function(e){
var e=e||window.event;
x=e.clientX-cvs.offsetLeft;
y=e.clientY-cvs.offsetTop;
ctx.strokeStyle=color;
ctx.lineWidth=lineW;
ctx.lineTo(x,y);
ctx.stroke();
}
document.onmouseup=function(){
document.onmousemove=null;
}
}
btn.onclick=function(){
ctx.clearRect(0,cvs.width,cvs.height);
}
range.onchange=function(){
lineW=range.value;
sb.innerHTML='线条粗细：'+range.value;
}
>
>
>
