Add pop-up dialog box in WeChat applet

<view>提示：{{tip}}</view>
<button type="default" bindtap="showModal">点击我弹出modal对话框</button>
<view>
 <modal title="modal对话框" hidden="{{modalHidden}}" confirm-text="确定" cancel-text="取消" bindconfirm="modalBindaconfirm" bindcancel="modalBindcancel">您好，我是modal对话框</modal>
</view>

Page({
 data:{
  // text:"这是一个页面"
  tip:'',
  buttonDisabled:false,
  modalHidden:true,
  show:false
 },
 showModal:function(){
  this.setData({
   modalHidden:!this.data.modalHidden
  })
 },
 modalBindaconfirm:function(){
   this.setData({
   modalHidden:!this.data.modalHidden,
   show:!this.data.show,
   tip:'您点击了【确认】按钮！',
   buttonDisabled:!this.data.buttonDisabled
  })
 },
 modalBindcancel:function(){
   this.setData({
   modalHidden:!this.data.modalHidden,
   tip:'您点击了【取消】按钮！'
  })
 }
})