vue图片转base64格式的方法示例

const path = require('@/assets/images/test.png')

imgUrlToBase64(url) {
      return new Promise((resolve, reject) => {
        if (!url) {
          reject('请传入url内容')
        }
        if (/\.(png|jpe?g|gif|svg)(\?.*)?$/.test(url)) {
          // 图片地址
          const image = new Image()
          // 设置跨域问题
          image.setAttribute('crossOrigin', 'anonymous')
          // 图片地址
          image.src = url
          image.onload = () => {
            const canvas = document.createElement('canvas')
            const ctx = canvas.getContext('2d')
            canvas.width = image.width
            canvas.height = image.height
            ctx.drawImage(image, 0, 0, image.width, image.height)
            // 获取图片后缀
            const ext = url.substring(url.lastIndexOf('.') + 1).toLowerCase()
            // 转base64
            const dataUrl = canvas.toDataURL(`image/${ext}`)
            resolve(dataUrl || '')
          }
        } else {
          // 非图片地址
          reject('非(png/jpe?g/gif/svg等)图片地址');
        }
      })
    },

getBase64(imgUrl) {
      return new Promise((resolve, reject) => {
        if (!imgUrl) {
          reject('请传入imgUrl内容')
        }
        if (/\.(png|jpe?g|gif|svg)(\?.*)?$/.test(imgUrl)) {
          window.URL = window.URL || window.webkitURL
          var xhr = new XMLHttpRequest()
          xhr.open('get', imgUrl, true)
          xhr.responseType = 'blob'
          xhr.onload = function() {
            if (this.status == 200) {
              // 得到一个blob对象
              var blob = this.response
              const oFileReader = new FileReader()
              oFileReader.onloadend = function(e) {
                const base64 = e.target.result
                resolve(base64 || '')
              }
              oFileReader.readAsDataURL(blob)
            }
          }
          xhr.send()
        } else {
          // 非图片地址
          reject('非(png/jpe?g/gif/svg等)图片地址')
        }
      })
    },