微信小程序图片和签名

图片上传功能

chooseImage(e) {
    wx.chooseImage({
      sizeType: ['original', 'compressed'], //可选择原图或压缩后的图片
      sourceType: ['album', 'camera'], //可选择性开放访问相册、相机
      success: res => {
        const images = this.data.images.concat(res.tempFilePaths)
        // 限制最多只能留下3张照片
        this.data.images = images.length <= 3 ? images : images.slice(0, 3)
        this.setData(this.data)
        console.log(this.data)
      }
    })
  },

  removeImage(e) {
    const idx = e.target.dataset.idx
    this.data.images.splice(idx, 1)
    this.setData(this.data)
  },

  handleImagePreview(e) {
    const idx = e.target.dataset.idx
    const images = this.data.images
    wx.previewImage({
      current: images[idx], //当前预览的图片
      urls: images, //所有要预览的图片
    })
  },

  submitForm(e) {
    const title = this.data.title
    const content = this.data.content
    const imagess = this.data.images
    var that = this
    console.log(imagess);
    wx.uploadFile({
      url: 'http://127.0.0.1/upload.php',
      filePath: imagess[0],
      name: 'qimg',
      timeout: 10000,
      success: function(res){
        if(res.statusCode == 200){
          console.log(title)
          console.log(content)
          wx.request({
            url: 'http://127.0.0.1/tijiao.php',
            method: 'post',
            data: {
              x: res.data,
              y: title,
              z: content
            },
            header: {
              'content-type': 'application/x-www-form-urlencoded' // 默认值
            },
            success(res) {
              console.log(res)
            }
          })
        }
      }
    })
  },

签名功能：

<view class="container">
  <canvas canvas-id="firstCanvas" id='firstCanvas' bindtouchstart="bindtouchstart" bindtouchmove="bindtouchmove"></canvas>
  <view class="btn">

    <button type="warn" bindtap='clear'>
      清除
    </button>
    <button type="primary" bindtap='export'>
      提交
    </button>
  </view>
</view>

const app = getApp()

Page({
  data: {
    context: null,
    index: 0,
    height: 0,
     0
  },
  /**记录开始点 */
  bindtouchstart: function (e) {
    this.data.context.moveTo(e.changedTouches[0].x, e.changedTouches[0].y)
  },
  /**记录移动点，刷新绘制 */
  bindtouchmove: function (e) {

    this.data.context.lineTo(e.changedTouches[0].x, e.changedTouches[0].y);
    this.data.context.stroke();
    this.data.context.draw(true);
    this.data.context.moveTo(e.changedTouches[0].x, e.changedTouches[0].y);
  },

  /**清空画布 */
  clear: function () {
    this.data.context.clearRect(0, 0, this.data.width, this.data.height);
    this.data.context.draw();
    this.data.context.setStrokeStyle('#00ff00')
    this.data.context.setLineWidth(2)
    this.data.context.setFontSize(20)
    let str = "签名区域";
    this.data.context.fillText(str, Math.ceil((this.data.width - this.data.context.measureText(str).width) / 2), Math.ceil(this.data.height / 2) - 20)
    this.data.context.draw()
  },
  /**导出图片 */
  export: function () {
    const that = this;
    this.data.context.draw(false, wx.canvasToTempFilePath({
      x: 0,
      y: 0,
       that.data.width,
      height: that.data.height,
      destWidth: that.data.width,
      destHeight: that.data.height,
      fileType: 'jpg',
      canvasId: 'firstCanvas',
      success(res) {
        wx.uploadFile({
          url: 'http://127.0.0.1/upload.php',
          filePath: res.tempFilePath,
          name: 'qimg',
          success(res) {
            console.log(res)
          },
          fail(err) {
            wx.showToast({
              title: '上传失败',
              icon: 'none',
              duration: 2000
            })
          }
        })

      },
      fail() {
        wx.showToast({
          title: '导出失败',
          icon: 'none',
          duration: 2000
        })
      }
    }))

  },
  onLoad: function (options) {
    console.log(options.id);
    if (options.id) {
      wx.showToast({
        title: '姓名' + options.id,
        icon: 'success',
        duration: 2000
      })
    }
  },
  onShow: function () {
    let query = wx.createSelectorQuery();
    const that = this;
    query.select('#firstCanvas').boundingClientRect();
    query.exec(function (rect) {
      let width = rect[0].width;
      let height = rect[0].height;
      that.setData({
        width,
        height
      });
      const context = wx.createCanvasContext('firstCanvas')
      that.setData({
        context: context
      })
      context.setStrokeStyle('#00ff00')
      context.setLineWidth(2)
      context.setFontSize(20)
      let str = "";
      context.fillText(str, Math.ceil((width - context.measureText(str).width) / 2), Math.ceil(height / 2) - 20)
      context.draw()
    });
  }
})