当需要对一个集合遍历删除元素的时候，都应该倒着删

int nowRemoveIndex = combination.Count() - 1;
while (true)
{
if (combination.Count() > lastCombitionCount)
combination.RemoveAt(nowRemoveIndex);
else
break;
nowRemoveIndex--;
}

let machineId = app.globalData.machineId
for (let i = cartCache.length - 1; i >= 0; i--) {
if (cartCache[i].MachineID === machineId) {
cartCache.splice(i, 1)
console.log(‘已清理一条缓存：‘)
console.log(cartCache[i])
}
}

let testArray1 = [1,3,4,5,2,7]
let testArray2 = [1,3,4,5,2,7]
for (let i = 0; i ) {
if(testArray1[i] >= 4)
testArray1.splice(i,1)
}
for (let i = testArray2.length - 1; i >= 0; i--) {
if(testArray2[i] >= 4)
testArray2.splice(i,1)
}
console.log(‘testArray1的结果为：‘)
console.log(testArray1)
console.log(‘testArray2的结果为：‘)
console.log(testArray2)