homework1/index.js at master · 060143A/homework1 · GitHub

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// index.js
// 获取应用实例
const app = getApp()

Page({
  data: {
    num:'0',
    op:''
  },
result: null,
isClear: false,
numBtn: function(e) {
　var num = e.target.dataset.val
　if (this.data.num === '0' || this.isClear) {
　 this.setData({ num: num })
　 this.isClear = false
　} else {
　 this.setData({ num: this.data.num + num })
 }
},
opBtn: function(e) {
　var op = this.data.op
　var num = Number(this.data.num)
　 this.setData({ op: e.target.dataset.val })
　if (this.isClear) {
　  return
　}
　this.isClear = true
　if (this.result === null) {
　  this.result = num
　  return
　}
　if (op === '+'){
　  this.result = this.result + num
　} else if (op === '-') {
　  this.result = this.result - num
　} else if (op === '*') {
  　this.result = this.result * num
  } else if (op === '/') {
  　this.result = this.result / num
  } else if (op === '%') {
  　this.result = this.result % num
  }
  this.setData({ num: this.result + '' })
},
dotBtn: function(){
  if(this.isClear){
    this.isClear=false
    return
  }
  this.setData({num:this.data.num+'.'})
},
delBtn:function(){
  var num = this.data.num.substr(0,this.data.num.length-1)
  this.setData({num: num==='' ?'0' :num})
},
resetBtn:function(){
  this.result = null
  this.isClear = false
  this.setData({ num:'0',op:''})
}})