è¿ä¸ªå¯ä»¥ç¨canvasæ¥ç»ï¼å
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æ¹æ³ä¸ï¼htmlé¨ååä¸ä¸ªdiv
<div></div>
css é¨åï¼div{
width:200px; //ç»200åç´ ç宽
height:200px; //ç»200åç´ çé«
border:1px solid #000; //ç»ä¸ä¸ªè¾¹æ¡ é¢è²ä¸ºé»è²
background:transparent; // ç»è¿ä¸ªçåä¸ä¸ªéæçèæ¯è²
}
å¥½äº ï¼è¿ä¸ªæ¯ä¸ä¸ªé常ç®åç ç©å½¢çåï¼ä¸è¿é常é½æ¯ç¨H5 çcanvasæ¥åç
æ¹æ³äºï¼ html代ç ï¼å建canvasç»å¸
<canvas id="myCanvas">æ¨çæµè§å¨ä¸æ¯æH5 canvaså±æ§</canvas>
ç¶åå°±æ¯js é¨åäº
var c=document.getElementById("myCanvas"); //è·åcanvas
var ctx=c.getContext("2d"); å建ä¸ä¸ª2D 对象
ctx.beginPath(); //
ctx.lineWidth="6"; //线æ¡å®½åº¦
ctx.strokeStyle="red"; //设置为é»è²
ctx.rect(5,5,290,140); //å建ç©å½¢ï¼èµ·å§ç¹çx yåæ ï¼åç©å½¢å®½é«
ctx.stroke(); //ç»å¶ç©å½¢ï¼æ å¡«å
ï¼ [æå¡«å
ç¨ ctx.fillï¼ï¼]
ä¹æ¯å¯ä»¥ç´æ¥å
var canvas=document.getElementById('myCanvas');
var ctx=canvas.getContext('2d');
ctx.fillStyle='#FF0000';
ctx.fillRect(0,0,80,100); //èµ·å§åæ åå¡«å
è²
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var c=document.getElementById("myCanvas");
var cxt=c.getContext("2d");
cxt.moveTo(10,10); //èµ·å§ç¹
cxt.lineTo(50,10); //ç»æç¹ åæ¶ä¹æ¯ä¸ä¸ä¸ªç»æç¹çèµ·å§ç¹
cxt.lineTo(50,50);
cxt.lineTo(10,50);
cxt.lineTo(10,10);
cxt.stroke();
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