String()

需要截取的字符串.substring(0, 几)

var data = 3.1415926535
data.toFixed(2) // 3.14
var data1 = 3.1455926535
data.toFixed(2) // 3.15

export const sortArray = (arr) => {
  var interval = parseInt(arr.length / 2) // 分组间隔设置
  while(interval > 0){
    for(var i = 0; i < arr.length; i ++){
      var n = i
      while(Number(arr[n].distance) < Number(arr[n - interval] ? arr[n - interval].distance : ‘‘) && n > 0){
        var temp = arr[n]
        arr[n] = arr[n - interval]
        arr[n - interval] = temp
        n = n - interval
      }
    }
    interval = parseInt(interval / 2)
  }
  return arr
}