Make a simple sketchpad code using JS and html

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Release: 2017-11-30 14:11:57
Original
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Today I will teach you how to make a small program, using CSS3, H5 and JS to make a fun simple drawing board. Friends who are interested can try it. The code is posted below. Everyone can also use their creativity to change some functions.

html:
<body>
<canvas width="800" height="600" id="c1">
<span>
</span>
</canvas>
<ul id="ul1">
<li>颜色版:<input id="color" type="color"/></li>
<li>笔触:<input id="num" type="number" min="0" max="100"/></li>
<li></li>
</ul>
</body>
css:
<style>
*{ margin:0; padding:0;}
body{ background:#000;}
canvas{ background:#fff; float:left;}
span{ color:#fff; font-size:80px;}
#ul1{width:100px;height:600px; float:left; background:#ccc;}
</style>
javascript:
 
<script>
window.onload=function(){
var oC=document.getElementById(&#39;c1&#39;);
var oColor=document.getElementById(&#39;color&#39;);
var oNum=document.getElementById(&#39;num&#39;);
var gd=oC.getContext(&#39;2d&#39;);//画笔
oNum.onchange=function(){
gd.lineWidth = oNum.value;
strokeFn();
};
oColor.onchange=function(){
gd.strokeStyle = oColor.value;
strokeFn();
};
strokeFn();
function strokeFn(){
gd.beginPath();
oC.onmousedown=function(ev){
gd.moveTo(ev.clientX,ev.clientY);
oC.onmousemove=function(ev){
gd.lineTo(ev.clientX,ev.clientY);
gd.stroke();
};
oC.onmouseup=function(){
oC.onmousemove=oC.onmouseup=null;
};
return false;
};
}
};
</script>
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I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

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