CanvasRenderingContext2D:measureText() 方法

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

CanvasRenderingContext2D.measureText() 方法返回一个包含被测量文本相关信息(例如它的宽度)的 TextMetrics 对象。

语法

js
measureText(text)

参数

text

需要测量的文本字符串。

返回值

TextMetrics 对象。

示例

给定 <canvas> 元素:

html
<canvas id="canvas"></canvas>

使用下面的代码,你能得到 TextMetrics 对象:

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

let text = ctx.measureText("Hello world");
console.log(text.width); // 56;

规范

Specification
HTML Standard
# dom-context-2d-measuretext-dev

浏览器兼容性

BCD tables only load in the browser

参见