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('c1'); var oColor=document.getElementById('color'); var oNum=document.getElementById('num'); var gd=oC.getContext('2d');//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>
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!
Related reading:
How to change the mouseover style without using CSS
How to use CSS to create an image rotation effect
How to optimize HTML web pages
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