onUpdate-HAP NodeJS Javascript

我有以下代码：

cType: types.ROTATION_SPEED_CTYPE,
    onUpdate: function(value) { console.log("Change:",value); execute("Fan", "Fan Speed", value); },
    perms: ["pw","pr","ev"],
    format: "float",
    initialValue: 100,
    supportEvents: false,
    supportBonjour: false,
    manfDescription: "Change the speed  of the fan",
    designedMinValue: 0,
    designedMaxValue: 99,
    designedMinStep: 33,
    unit: "percentage"

---

如何根据不同的“值”执行不同的脚本，特别是在“onUpdate”上，还有一个函数

var execute = function(accessory,characteristic,value){ 
    console.log("executed accessory: " + accessory + ", and characteristic: " + characteristic + ", with value: " +  value + "."); }

附件将有“风扇”，特性将有“风扇转速”，值将有值（0-99）

把这样的东西放在它的位置上

var execute = function(accessory,characteristic,value) {

   if(value >= 30) {
    ...
   } else 
    ...