Javascript 无法读取未定义问题的属性

我在javascript中有一个对象：

const systolicAndDiastolicAndPulseAverage = [
    {
      name:'Systolic Average',
      style:'#FFDA83',
      id:'right',
      category:'Systolic Average',
      data: [
        { day: 23, value: 100 },
        { day: 24, value: 110 },
        { day: 25, value: 115 },
        { day: 26, value: 112 },
        { day: 27, value: 108 },
        { day: 28, value: 95 },
        { day: 29, value: 99 },
        { day: 30, value: 89 },
        { day: 31, value: 124 },
      ]
    },
    {
      name:'Diastolic Average',
      style:'#EA1D75',
      id:'left',
      category:'Diastolic Average',
      data: [
        { day: 23, value: 61 },
        { day: 24, value: 65 },
        { day: 25, value: 82 },
        { day: 26, value: 74 },
        { day: 27, value: 69 },
        { day: 28, value: 59 },
        { day: 29, value: 67 },
        { day: 30, value: 71 },
        { day: 31, value: 74 },
      ]
    },
    {
      name:'Pulse Average',
      style:'#5FE3A1',
      category:'Pulse Average',
      data: [
        { day: 23, value: 80 },
        { day: 24, value: 83 },
        { day: 25, value: 65 },
        { day: 26, value: 72 },
        { day: 27, value: 79 },
        { day: 28, value: 93 },
        { day: 29, value: 96 },
        { day: 30, value: 91 },
        { day: 31, value: 46 },
      ]
    }
  ]

所以基本上我要做的是迭代里面的每个数组（有3个数组），每次我在里面迭代，检查值是否在两端之间，如果它是真的，我会在计数器上加1。（例如，我将首先进入收缩平均值和里面的数据数组，迭代所有值并检查它们）

for（让我输入收缩舒张脉冲幅度）{
设dataParsed=systolicAndDiastolicAndPulseAverage[i]。数据；
对于（设j=0；j
//1.错误不是哪一行？@RedBaron let currentValue=dataParsed[j].value this one为什么不将
.map
映射到数据数组上？数组是基于零的，因此最后一个元素位于
array.length-1
。您的
for
循环转到
array.length
，它超出了bounds@Andreas谢谢你我刚注意到了我不知道是怎么滑倒的你改变了什么？为什么？
for(let i in systolicAndDiastolicAndPulseAverage){
            let dataParsed = systolicAndDiastolicAndPulseAverage[i].data;

            for(let j=0;j<=dataParsed.length;j++)
            {

                let currentValue = dataParsed[j].value
                if(currentValue.value <= 89){
                    lowerEnd++;
                }
                if(currentValue.value>=90 && currentValue.value <= 119){
                    lowMed++;
                }
                if(currentValue.value >= 120 && currentValue <=139){
                    highMed++;
                }
                else{
                    high++
                }
            }
        }

        console.log(lowerEnd)
        console.log(lowMed)
        console.log(highMed)
        console.log(high)

for(let i in systolicAndDiastolicAndPulseAverage){
  let dataParsed = systolicAndDiastolicAndPulseAverage[i].data;

for(let j=0;j <  dataParsed.length;j++)
  {

     let currentValue = dataParsed[j]
      if(currentValue.value <= 89){
          lowerEnd++;
      }
      if(currentValue.value>=90 && currentValue.value <= 119){
          lowMed++;
      }
      if(currentValue.value >= 120 && currentValue <=139){
          highMed++;
      }
      else{
          high++
      }
  }
}