<view class="form_section">
        <view class="form_section_title">密码</view>
        <view class="form_section_cell">
          <input class="weui-input" name="input" password='{{isPassword}}' bindinput="passwordInput" type="text" placeholder="请输入登录密码" placeholder-style="color: #BFC6CB;" />
          <image wx:if="{{isShowImg}}" class='showImg' bindtap='showPassword' src="http://www.wxapp-union.com/{{isPassword ?'img/common_btn_unlook.png' : 'img/common_btn_look.png' }}"></image>
        </view>
      </view>

  data: {
    password:"",
    isShowImg: false,
    isPassword: true,
    canIUse: wx.canIUse('button.open-type.getUserInfo')
  },

  passwordInput: function (e) {
    let password = e.detail.value
    this.setData({
      password,
      isShowImg:true
    })
  },