微信小程序计算三角形面积，三棱锥体积

index.wxml:

<view>
  <form bindsubmit='formsubmit'>
    <view>计算三角形的面积</view>
    <text>请输入三角形的边长：</text>
    <input type='digit' name="a" placeholder='第一条边长'></input>
    <input type='digit' name="b" placeholder='第二条边长'></input>
    <input type='digit' name="c" placeholder='第三条边长'></input>
    <button form-type='submit'>计算面积</button>
    <text>三角形面积：{{result}}</text>   
  </form>
  <form bindsubmit='formsubmit2'>
    <view>计算三角形的体积</view>
    <text>请输入三棱锥的边长：</text>
    <input type='digit' name="a" placeholder='第一条边长a'></input>
    <input type='digit' name="b" placeholder='第二条边长b'></input>
    <input type='digit' name="c" placeholder='第三条边长c'></input>
    <input type='digit' name="d" placeholder='第四条边长d(与第一条对边)'></input>
    <input type='digit' name="ee" placeholder='第五条边长ee(与第二条对边)'></input>
    <input type='digit' name="f" placeholder='第六条边长f(与第三条对边)'></input>
    <button form-type='submit'>计算体积</button>
    <text>三棱锥的体积：{{result2}}</text>
  </form>
</view>

index.js:

// pages/index/index.js
Page({

  /**
   * 页面的初始数据
   */
  data: {
    result: "123",
    result2:"123"
  },
  formsubmit: function(e) {
    console.log(e)
    var a = Number(e.detail.value.a)
    var b = Number(e.detail.value.b)
    var c = Number(e.detail.value.c)
    var s = " "
    if ((a + b > c) && (a + c > b) && (b + c > a)) {
      s = 1 / 4 * Math.sqrt((a + b + c) * (a + b - c) * (a + c - b) * (b + c - a))
    } else {
      s = "不能构成三角形"
    }
    this.setData({result:s})
  },
  formsubmit2: function (e) {
    console.log(e)
    var a = Number(e.detail.value.a)
    var b = Number(e.detail.value.b)
    var c = Number(e.detail.value.c)
    var d = Number(e.detail.value.d)
    var ee = Number(e.detail.value.ee)
    var f = Number(e.detail.value.f)
    var s = " "
    var D=b*b+c*c-d*d
    var E=a*a+c*c-ee*ee
    var F=a*a+b*b-f*f
    if ((a + b > c) && (a + c > b) && (b + c > a)) {
      s = 1 / 12 * Math.sqrt((4*a*a*b*b*c*c) - (a*a*D*D) - (b*b*E*E) -(c*c*F*F)+(D*E*F))
    } else {
      v = "不能构成三棱锥"
    }
    this.setData({ result2: s })
  }
})