计算SVG元素的尺寸

Calculate dimentions of SVG element

本文关键字：元素 SVG 计算      更新时间：2023-09-26

如何跨浏览器以一致的方式计算SVG元素的尺寸?

var svg = document.querySelector('svg');
var gBCR = svg.getBoundingClientRect().width;
var bBox = svg.getBBox().width;
var gCS = window.getComputedStyle(svg, null).width;
console.log('gBCR: ' + Math.round(gBCR) + ' - gCS: ' + gCS + ' - bBox: ' + Math.round(bBox));
// What I got:
// Firefox: gBCR: 142 - gCS: 400px - bBox: 363
// Chrome:  gBCR: 400 - gCS: 400px - bBox: 363

http://jsfiddle.net/23x8S/

我的svg元素: 
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" height="200px">
    <title>HTML5 Logo</title>
    <polygon fill="#E44D26" points="107.644,470.877 74.633,100.62 437.367,100.62 404.321,470.819 255.778,512" />
    <polygon fill="#F16529" points="256,480.523 376.03,447.246 404.27,130.894 256,130.894             " />
    <polygon fill="#EBEBEB" points="256,268.217 195.91,268.217 191.76,221.716 256,221.716 256,176.305 255.843,176.305 142.132,176.305 143.219,188.488 154.38,313.627 256,313.627" />
    <polygon fill="#EBEBEB" points="256,386.153 255.801,386.206 205.227,372.55 201.994,336.333 177.419,336.333 156.409,336.333 162.771,407.634 255.791,433.457 256,433.399" />
    <path d="M108.382,0h23.077v22.8h21.11V0h23.078v69.044H152.57v-23.12h-21.11v23.12h-23.077V0z" />
    <path d="M205.994,22.896h-20.316V0h63.72v22.896h-20.325v46.148h-23.078V22.896z" />
    <path d="M259.511,0h24.063l14.802,24.26L313.163,0h24.072v69.044h-22.982V34.822l-15.877,24.549h-0.397l-15.888-24.549v34.222h-22.58V0z" />
    <path d="M348.72,0h23.084v46.222h32.453v22.822H348.72V0z" />
    <polygon fill="#FFFFFF" points="255.843,268.217 255.843,313.627 311.761,313.627 306.49,372.521 255.843,386.191 255.843,433.435 348.937,407.634 349.62,399.962 360.291,280.411 361.399,268.217 349.162,268.217" />
    <polygon fill="#FFFFFF" points="255.843,176.305 255.843,204.509 255.843,221.605 255.843,221.716 365.385,221.716 365.385,221.716 365.531,221.716 366.442,211.509 368.511,188.488 369.597,176.305" />
<svg>

你的方法似乎是正确的，它在两种情况下都给出了正确的宽度，问题是SVG组件在Firefox和Chrome中呈现不同，在Chrome中使用100%的可用宽度，在Firefox中使用最小宽度来显示内容。

这个跟踪器解释了为什么Firefox不使用"100%"作为默认宽度:https://bugzilla.mozilla.org/show_bug.cgi?id=611099

相关文章：