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HTML 参考手册
HTML canvas textBaseline 属性
tryhtml5_canvas_textbaseline
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<!DOCTYPE html> <html> <body> <h1>HTML5 Canvas</h1> <h2>The textBaseline Property</h2> <canvas id="myCanvas" width="400" height="200" style="border:1px solid grey"></canvas> <script> const c = document.getElementById("myCanvas"); const ctx = c.getContext("2d"); //Draw a red line at y=100 ctx.strokeStyle = "red"; ctx.moveTo(5, 100); ctx.lineTo(395, 100); ctx.stroke(); ctx.font = "20px Arial" //Place each word at y=100 with different textBaseline values ctx.textBaseline = "top"; ctx.fillText("Top", 5, 100); ctx.textBaseline = "bottom"; ctx.fillText("Bottom", 50, 100); ctx.textBaseline = "middle"; ctx.fillText("Middle", 120, 100); ctx.textBaseline = "alphabetic"; ctx.fillText("Alphabetic", 190, 100); ctx.textBaseline = "hanging"; ctx.fillText("Hanging", 290, 100); </script> </body> </html>