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HTML 参考手册
HTML canvas measureText() 方法
tryhtml5_canvas_measuretext
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<!DOCTYPE html> <html> <body> <h1>HTML5 Canvas</h1> <h2>The measureText() Method</h2> <canvas id="myCanvas" width="300" height="150" style="border:1px solid grey"></canvas> <script> const c = document.getElementById("myCanvas"); const ctx = c.getContext("2d"); ctx.font = "30px Arial"; var txt = "Hello World" ctx.fillText("width:" + ctx.measureText(txt).width, 10, 50); ctx.fillText(txt, 10, 100); </script> </body> </html>