jQuery 如何通过jquery获取canvas元素？
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How to get the canvas element by jquery?
提问by Erxin
Currently I'm play with the html5 canvas, the simple code is below:
目前我正在使用 html5 画布，简单的代码如下：
<!DOCTYPE HTML>
<html>
<head>
<title></title>
<script src="Scripts/jquery-2.0.3.min.js"></script>
<script>
$(function () {
//THIS WILL NOT WORK!
//var cv = $("#cv");
//THIS WORKS FINE.
var cv = document.getElementById("cv");
ct = cv.getContext("2d");
var mText = "hi";
var x = cv.width / 2;
var y = cv.height / 2;
ct.textAligh = "center";
ct.fillText(mText, x, y);
});
</script>
</head>
<body>
<div style="width:200px; height:200px; margin:0 auto; padding:5px;">
<canvas id="cv" width="200" height="200" style="border:2px solid black">
Your browser doesn't support html5! Please download a fitable browser.
</canvas>
</div>
</body>
</html>
The canvas element could only be picked by the method document.getElementById, but the jQuery method is not working. Is there a way to get the original html from the jquery object or am I miss using something? Thanks in advance!
画布元素只能由方法 document.getElementById 选取，但 jQuery 方法不起作用。有没有办法从 jquery 对象中获取原始 html 还是我错过了使用某些东西？提前致谢！
回答by mopdobopot
jQuery's $(<selector>)returns a collection of nodes (in fact it is "object masquerades as an array" as the doc says) so just use $('#cv').get(0)instead of document.getElementById("cv")
jQuery$(<selector>)返回一个节点集合（实际上它是“对象伪装成一个数组”，正如文档所说）所以只需使用$('#cv').get(0)而不是document.getElementById("cv")
回答by Vivin Paliath
回答by Einacio
using get()
使用 get()
explore the jquery doc, it's very useful
探索 jquery 文档，它非常有用
