<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<canvas id="canvas" style="border:1px solid red;display:block;margin:50px auto;">
</canvas>
<script>
window.onload=function(){
var canvas=document.getElementById("canvas");
canvas.width=800;
canvas.height=800;
var context=canvas.getContext("2d");
var backCanvas=createBackgroundCanvas();
var pattern=context.createPattern(backCanvas,"repeat");
context.fillStyle=pattern;
context.fillRect(0,0,800,800);
}
function createBackgroundCanvas(){
var backCanvas=document.createElement("canvas");
var backCanvas.width=100;
var backCanvas.height=100;
var backCanvasContext=backCanvas.getContext("2d");
backCanvasContext.beginPath();
backCanvasContext.moveTo(15,15);
backCanvasContext.lineTo(50,50);
backCanvasContext.lineWidth=10;
backCanvasContextt.strokeStyle="green"
backCanvasContext.stroke();
return backCanvas;
}
</script>
</body>
</html>问题一大堆，首先backCanvas声明一个就行了 声明这么多干嘛，还有backCanvasContextt.strokeStyle="green"都输入错了
function createBackgroundCanvas(){
var backCanvas=document.createElement("canvas");
backCanvas.width=100;
backCanvas.height=100;
backCanvasContext=backCanvas.getContext("2d");
backCanvasContext.beginPath();
backCanvasContext.moveTo(15,15);
backCanvasContext.lineTo(50,50);
backCanvasContext.lineWidth=10;
backCanvasContext.strokeStyle="green";
backCanvasContext.stroke();
return backCanvas;
}
我也想问这个问题！！