我使用window.location设置注射。
在我的接近导入的模块中，我定义了变量
const flag = window.location.search.includes('flag');
...
{ provide: FLAG, useValue: flag },
并且它与JIT编译一样正常工作
但是，当我切换到AoT时，它会中断
useFactory适用于两种情况
export function flagFactory() {
return window.location.search.includes('flag');;
}
...
{ provide: FLAG, useFactory: flagFactory },
为什么undefined useValue和true useFactory获得{{1}}？
答案 0 :(得分：1)
我的猜测是from django.core.management import BaseCommand
from multiprocessing import Pool
from django.contrib.auth.models import User
from pprint import pprint
from CentralControl.models import Product, Supplier
from CentralControl.management.helpers.map_ingram import *
from CentralControl.management.helpers.helper_generic import *
from tqdm import tqdm
from CentralControl.management.helpers.config import get_ingram
import os, sys, csv, zipfile, CentralControl
# Run Script as 'SYSTEM'
user = User.objects.get(id=1)
# Get Connection config.
SUPPLIER_CODE, FILE_LOCATION, FILE_NAME = get_ingram()
class Command(BaseCommand):
def handle(self, *args, **options):
list_in = get_file()
list_current = get_current_list()
pool = Pool(6)
pool.map(compare_lists(list_in, list_current))
pool.close()
def compare_lists(list_in, list_current):
for row_current in tqdm(list_current):
for row_in in list_in:
if row_in['order_code'] == row_current['order_code']:
#do more stuff here.
pass
def get_current_list():
try:
supplier = Supplier.objects.get(code='440040')
current_list = Product.objects.filter(supplier=supplier).values()
return current_list
except:
print('Error no products with supplier')
exit()
def get_file():
with zipfile.ZipFile(FILE_LOCATION + 'incoming/' + FILE_NAME, 'r') as zip:
with zip.open('228688 .csv') as csvfile:
reader = csv.DictReader(csvfile)
list_in = (list(reader))
for row in tqdm(list_in):
row['order_code'] = row.pop('Ingram Part Number')
row['order_code'] = (row['order_code']).lstrip("0")
row['name'] = row.pop('Ingram Part Description')
row['description'] = row.pop('Material Long Description')
row['mpn'] = row.pop('Vendor Part Number')
row['gtin'] = row.pop('EANUPC Code')
row['nett_cost'] = row.pop('Customer Price')
row['retail_price'] = row.pop('Retail Price')
row['qty_at_supplier'] = row.pop('Available Quantity')
row['backorder_date'] = row.pop('Backlog ETA')
row['backorder_date'] = (row['backorder_date'])
row['backorder_qty'] = row.pop('Backlog Information')
zip.close()
#commented out for dev precess.
#os.rename(FILE_LOCATION + 'incoming/' + FILE_NAME, FILE_LOCATION + 'processed/' + FILE_NAME)
return list_in
静态分析AoT结构之外的代码。所以它会看到NgModule并提前执行此操作。但是在编译时，这显然会返回window.location.search.includes。在使用undefined的情况下，它不会尝试提前执行主体，仅在运行时执行。
这是AOT的（很多）陷阱之一。始终尝试将每个符号静态分析