為什么我的全是黑 我根本沒設置黑色相關的顏色啊 求幫忙
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="./css/video.css">
<script src="./js/jquery2.1.4.min.js"></script>
<title>1</title>
<style type="text/css">
#canvas{
border: 1px solid #aaa;
display: block;
margin: 50px auto;
}
</style>
</head>
<body>
<canvas id="canvas" width="800" height="800"></canvas>
<script>
var tangram = [
{p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"#caff67"},
{p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#67becf"},
{p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},
{p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"#f9f51a"},
{p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"#a594c0"},
{p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:"#fa8ecc"},
{p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"#f6ca29"},
]
window.onload =function(){
var canvas = document.getElementById("canvas");
canvas.width = 800;
canvas.height = 800;
var context = canvas.getContext("2d");
for(var i = 0; i< tangram.length; i++)
drow( ?tangram[i], context )
}
function drow ( piece,cxt){
cxt.beginPath();
cxt.moveTo(piece.p[0].x,piece.p[0].y);
for(var i = 1 ; i<piece.p.length;i++)
cxt.lineTo(piece.p[i].x,piece.p[i].y);
cxt.closePath();
cxt.fillStyle = piece.p.color;
cxt.fill();
}
</script>
</body>
</html>
2016-05-25
cxt.fillStyle = piece.p.color;
這個改為
cxt.fillStyle = piece.color;
你沒有調用到tangram里面的color; 默認黑色了吧