svg 转 png/jpg

const origin = location. host ; return url. indexOf ( 'data:' ) !== 0 && url. indexOf (origin) < 0 ; * @param url url -> image const loadImage = url => { return new Promise ( ( resolve, reject ) => { const img = new Image (); if ( isCrossOriginUrl (url)) { img. crossOrigin = 'Anonymous' ; img. onload = () => { resolve (img); img. onerror = function ( ) { const msg = 'Image load error: ' + url; reject ( new Error (msg)); img. src = url; * image元素 -> base64 Data * @param image image node export const imageToPng = ( image: HTMLImageElement ) => { const canvas = document . createElement ( 'canvas' ); const ctx = canvas. getContext ( '2d' ); canvas. width = image. width ; canvas. height = image. height ; ctx. drawImage (image, 0 , 0 , image. width , image. height ); return canvas. toDataURL ( 'image/png' ); * @param xml svg 的xml内容 export const svgToPng = async ( xml: string ) => { const base64 = window . btoa ( unescape ( encodeURIComponent (xml))); const image64 = `data:image/svg+xml;base64, ${base64} ` ; const image = await loadImage (image64); return imageToPng (image); * @param 读取文件内容 export const readFile = ( file, dataType = 'DataURL' ) => { return new Promise ( ( resolve, reject ) => { const reader = new FileReader (); const fnName = `readAs ${dataType} ` ; if (!reader[fnName]) { throw new Error ( 'File read error, dataType not support' ); reader. onerror = () => { reject ( new Error ( 'File read error' )); reader. onload = () => { resolve (reader. result ); reader[fnName](file); export const svgFile2Png = ( file ) => { return readFile (file, 'Text' ). then (svgToPng) 复制代码