vue保存圖片到本地

首先呢我們要，安裝一下依賴；

npm install html2canvas --save

接下來我們就直接上代碼了

 <van-tab title="簽到二維碼">
        <div class="QRCode-box">
          <!-- /static/images/QRCode-box.png -->
          <van-image src="/static/images/QRCode-box.png" />
          <van-image id="imageWrapper" class="QRCode" src="/static/images/QRCode-box.png" />
          <van-button color="#29c37f" type="info" @click="toSave">保存二維碼到手機</van-button>
        </div>
</van-tab>

 

 // 點擊保存
    toSave () {
      html2canvas(document.getElementById("imageWrapper")).then(canvas => {
        let saveUrl = canvas.toDataURL('image/png')
        let aLink = document.createElement('a')
        let blob = this.base64ToBlob(saveUrl)
        let evt = document.createEvent('HTMLEvents')
        evt.initEvent('click', true, true)
        aLink.download = '二維碼.jpg'
        aLink.href = URL.createObjectURL(blob)
        aLink.click()
        console.log(aLink.href)
        if (aLink.href) {
          Toast.success('保存成功')
        }
      })
    },
    // 這裏把圖片轉base64
    base64ToBlob (code) {
      let parts = code.split(';base64,')
      let contentType = parts[0].split(':')[1]
      let raw = window.atob(parts[1])
      let rawLength = raw.length
      let uInt8Array = new Uint8Array(rawLength)
      for (let i = 0; i < rawLength; ++i) {
        uInt8Array[i] = raw.charCodeAt(i)
      }
      return new Blob([uInt8Array], { type: contentType })
    },
  }

以上vue就可以實現保存圖片到本地了

 

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