SOURCE

// let arr = [{a:20,x:1},{a:20,x:1},{a:23,x:2},{a:31,x:3},{a:31,x:3},{a:20,x:4},{a:32,x:5},{a:32,x:5},{a:32,x:5}]
let arr = [{a:10,x:1},{a:10,x:1},{a:10,x:2}]

let polylineArr = []

let arrI = []
console.log(arr.every(it => {
    return it.a > 30 
}))
console.log(arr.every(it => {
    return it.a < 30 
}))
for(let i = 1; i<arr.length; i++) {
    let a = arr[i].a
    let _a = arr[i-1].a
    if (_a < 30 && a > 30) {
        arrI.push(i)
    } else if (_a > 30 && a < 30) {
        arrI.push(i)
    }
}
let ss = 0
arrI.forEach((it, index) => {
    if (index === arrI.length - 1) {
        polylineArr.push(arr.slice(ss))
    } else {
        polylineArr.push(arr.slice(ss, it+1))
        ss = it
    }
    
})
function test(arr, rate) {
    let newArr = []
    if (!Array.isArray(arr)) return
    let isWorkArr = arr.every(it => {
        return it.a < rate 
    })
    // 全部都是工作状态
    if (isWorkArr) {
     return {
        points: arr,
        color:"#EE1212",
        width:2
      }   
    }
    let isNoWorkArr = arr.every(it => {
        return it.a > rate 
    })
    // 全部都是不在工作状态
    if (isNoWorkArr) {
     return {
        points: arr,
        color:"#EEfffd",
        width:2
      }   
    }
    // 混合状态
    let polylineArr = []
    let arrI = []
    for(let i = 1; i<arr.length; i++) {
        let a = arr[i].a
        let _a = arr[i-1].a
        if (_a < 30 && a > 30) {
            arrI.push(i)
        } else if (_a > 30 && a < 30) {
            arrI.push(i)
        }
    }
    let currtInx = 0
    arrI.forEach((it, index) => {
        if (index === arrI.length - 1) {
            polylineArr.push(arr.slice(currtInx))
        } else {
            polylineArr.push(arr.slice(currtInx, it+1))
            currtInx = it
        }
    })
    polylineArr.forEach(it => {

    })
}
console.log(polylineArr)