帮忙看看怎么没有显示
D调是一种美
2016-07-08 20:12
<body>
<canvas id="canvas">你的浏览器无法打开请升级</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>
2回答
-
- _黑骑士
- 2016-07-10 00:19:02
因为函数名里的局部变量是piece，而不是data，在使用data时会去寻找全局变量data，而全局变量的data是一个数组，没有data.p和data.color属性
-
- 星梦客
- 2016-07-09 00:06:08
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)
把大括号里面的data换成piece
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