问题描述
<！DOCTYPE html>
< html lang =en>
< head runat =server>
< title>< / title>
< meta http-equiv =X-UA-Compatiblecontent =IE = Edge//>
< script type =text / javascript >
var c = document.getElementById（myCanvas）;
var ctx = c.getContext（2d）;
var grd = ctx.createLinearGradient（0,0,175,50）;
grd.addColorStop（0，＃FF0000）;
grd.addColorStop（1 ，＃00FF00）;
ctx.fillStyle = grd;
ctx.fillRect（0,0,175,50）;
< / script>
< / head>
< body>
< form id =form1runat =server>
<!DOCTYPE html>
<html lang="en">
<head runat="server">
<title></title>
<meta http-equiv="X-UA-Compatible" content="IE=Edge"//>
<script type="text/javascript">
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
var grd = ctx.createLinearGradient(0, 0, 175, 50);
grd.addColorStop(0, "#FF0000");
grd.addColorStop(1, "#00FF00");
ctx.fillStyle = grd;
ctx.fillRect(0, 0, 175, 50);
</script>
</head>
<body>
<form id="form1" runat="server">
< canvas id =myCanvaswidth =200height =100
style = border：1px solid＃000000;>
< / canvas>
<canvas id="myCanvas" width="200" height="100"
style="border:1px solid #000000;">
</canvas>
< / form>
< / body>
< / html> ;
我还需要做什么呢？我正在使用2010安装SP1.HTML5 intellisense来自页面而不是JS。
</form>
</body>
</html>
what else I need to do in this? I''m using 2010 where I install SP1.HTML5 intellisense is coming on page but not in JS.
推荐答案
window.onload = function() {
var c = document.getElementById("myCanvas");
...
... // more code here...
}
这篇关于Canvas Js函数未触发，给出null错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！