微信小程序实现动态设置placeholder提示文字及按钮选中/取消状态的方法

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var app = getApp()Page({ data: {  placeholder:'请输入',  ph:'',  num:1,  key:'', }, placeholder:function(e){  var num = e.currentTarget.dataset.num  this.setData({   ph: this.data.placeholder+e.currentTarget.dataset.key  })  this.setData({   num: num  })})