HTML canvas textBaseline 属性

实例

绘制一条 y=100 的红线，然后用不同的 textBaseline 值将每个单词放置在 y=100 的位置

JavaScript

const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

 
ctx.strokeStyle = "red";
ctx.moveTo(5, 100);
ctx.lineTo(395, 100);
ctx.stroke();

 
ctx.font = "20px Arial"

 
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);