65 lines
1.6 KiB
TypeScript
65 lines
1.6 KiB
TypeScript
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import {ref} from 'vue'
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import html2canvas from 'html2canvas';
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/**
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* 用于导出生成image
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*/
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export function useExportImage() {
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const exportRef = ref();
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/**
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* 导出图片触发事件
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* @param fileName
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*/
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function onExportImage(fileName) {
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let ele = exportRef.value;
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if(!ele){
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console.error('没有导出对象')
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return;
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}
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const size = {
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width: ele.offsetWidth,
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height: ele.offsetHeight
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}
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html2canvas(ele, { useCORS: true, logging: true }).then(async (canvas) => {
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const dataURL = canvas.toDataURL('image/png');
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await download(dataURL, size, fileName);
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});
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}
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async function download(imgUrl, size, fileName) {
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const dataUrl = await getBase64(imgUrl, size);
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const link:any = document.createElement('a');
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link.href = dataUrl;
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link.download = `${fileName}.png`;
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link.click();
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}
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function getBase64(url, size){
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return new Promise((resolve) => {
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let canvas:any = document.createElement('canvas');
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const ctx = canvas.getContext('2d');
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const img = new Image();
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// 允许跨域
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img.crossOrigin = 'Anonymous';
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img.src = url;
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img.onload = () => {
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// eslint-disable-next-line prefer-destructuring
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canvas.height = size.height;
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// eslint-disable-next-line prefer-destructuring
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canvas.width = size.width;
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ctx!.drawImage(img, 0, 0, size.width, size.height);
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const dataURL = canvas.toDataURL('image/png');
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canvas = null;
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resolve(dataURL);
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};
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});
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}
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return {
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exportRef,
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onExportImage
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}
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} |