指数资金流向(新)

获取沪深指数日资金流向，包含资金净流入、资金流入、资金流出、小单资金流入、小单资金流出、小单资金净流入等；单类判断标准：以成分股前20个交易日平均每笔成交金额为参考值，对比每笔的成交金额，小单-（0-1倍]；中单-（1-10倍]；大单-（10-100倍]；超大单-大于100倍或金额大于100万；流入以正数计，流出以负数计。Retrieves daily capital flows of Shanghai and Shenzhen stock indices, including net capital inflow, capital inflow, capital outflow, small-order capital inflow, small-order capital outflow, net small-order capital inflow, etc. The classification criteria for order sizes are as follows: Take the average transaction amount per trade over the previous 20 trading days of the constituent stocks as the reference value, and compare it with the transaction amount of each individual trade: small-order: (0, 1] times the reference; medium-order: (1, 10] times the reference; large-order: (10, 100] times the reference; mega-order: greater than 100 times the reference or transaction amount exceeding 1,000,000 RMB. Inflow values are recorded as positive numbers, while outflow values are recorded as negative numbers.