npm install html2canvas --save

import html2canvas from "html2canvas";

<el-button class="button-dalod" size="mini" title="生成圖片" @click="toImage()" icon="el-icon-download"></el-button>

// 頁面元素轉(zhuǎn)圖片
        toImage () {
            // 手動創(chuàng)建一個 canvas 標(biāo)簽
            const canvas = document.createElement("canvas")
            // 獲取父標(biāo)簽，意思是這個標(biāo)簽內(nèi)的 DOM 元素生成圖片
            // imageTofile是給截圖范圍內(nèi)的父級元素自定義的ref名稱
            let canvasBox = this.$refs.imageTofile
            // 獲取父級的寬高
            const width = parseInt(window.getComputedStyle(canvasBox).width)
            const height = parseInt(window.getComputedStyle(canvasBox).height)
            // 寬高 * 2 并放大 2 倍 是為了防止圖片模糊
            canvas.width = width * 2
            canvas.height = height * 2
            canvas.style.width = width + 'px'
            canvas.style.height = height + 'px'
            const context = canvas.getContext("2d");
            context.scale(2, 2);
            const options = {
                backgroundColor: null,
                canvas: canvas,
                useCORS: true
            }
            html2canvas(canvasBox, options).then((canvas) => {
                // toDataURL 圖片格式轉(zhuǎn)成 base64
                let dataURL = canvas.toDataURL("image/png")
                console.log(dataURL)
                this.downloadImage(dataURL)
            })
        },
        //下載圖片
        downloadImage(url) {
            // 如果是在網(wǎng)頁中可以直接創(chuàng)建一個 a 標(biāo)簽直接下載 
            let a = document.createElement('a')
            a.href = url
            a.download = '首頁截圖'
            a.click()
        },