幫忙看看怎么沒有顯示
<body>
? <canvas id="canvas">你的瀏覽器無法打開請升級</canvas> ?
? <script type="text/javascript">
? window.onload=function(){
? var canvas=document.getElementById("canvas");
var data=[
{p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#caff67"},
{p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"#67becf"},
{p:[{x:0,y:800},{x:400,y:800},{x:400,y:400}],color:"#ef3d61"},
{p:[{x:400,y:400},{x:600,y:600}],color:"#f9f51a"},
{p:[{x:400,y:400},{x:600,y:600},{x:400,y:800}],color:"#a594c0"},
{p:[{x:400,y:400},{x:600,y:600},{x:800,y:400}],color:"#fa8ecc"},
{p:[{x:600,y:200},{x:800,y:400}],color:"#f6ca29"}
]
canvas.width=800;
canvas.height=800;
var context=canvas.getContext("2d");
for(var i=0;i<data.length;i++){
? ? draw(data[i],context)
}
function draw(piece,cxt){
? ? cxt.beginPath()
? ? cxt.moveTo(data.p[0].x,data.p[0].y);
for(var i=0;i<data.p.length; i++){
? ? cxt.lineTo(data.p[i].x,data.p[i].y)
}
? ?cxt.closePath();
? ?cxt.fillStyle=data.color;
? ?cxt.fill();
}
}
</script>
2016-07-10
因為函數名里的局部變量是piece，而不是data，在使用data時會去尋找全局變量data，而全局變量的data是一個數組，沒有data.p和data.color屬性
2016-07-09
function draw(piece,cxt){
? ? cxt.beginPath()
? ? cxt.moveTo(data.p[0].x,data.p[0].y);
for(var i=0;i<data.p.length; i++){
? ? cxt.lineTo(data.p[i].x,data.p[i].y)
把大括號里面的data換成piece