typescript重写canvas --10.绘制文字2

1.使用 canvas 绘制文字

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8" />
</head>
<body>
<canvas id="myCanvas" width="450" height="400">
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</canvas>
<script type="text/javascript">
var canvas=document.getElementById("myCanvas");
var context=canvas.getContext("2d");  
    
//设定文字大小和字体
context.font="30px Arial";
//描画文字
context.strokeText("Good!",100,50);
    
</script>
</body>
</html>

显示效果如下

10.png

2.typescript重写canvas --绘制文字

html文件

<!DOCTYPE HTML>
<html>
<body>
<canvas id="myCanvas" width="450" height="400">
你的浏览器不支持HTML5
</canvas>
<script src="./js/10.js"></script>

</body>
</html>

ts文件

const canvas=<HTMLCanvasElement>document.getElementById("myCanvas")
const context=canvas.getContext("2d") 
if (context){
    //设定文字大小和字体
    context.font="30px Arial";
    //描画文字
    context.strokeText("Good!",100,50);  
}

生成的js文件

"use strict";
const canvas = document.getElementById("myCanvas");
const context = canvas.getContext("2d");
if (context) {
    //设定文字大小和字体
    context.font="30px Arial";
    //描画文字
    context.fillText("Good!",100,50);  
}