import requests import time headers = { 'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36', 'referer': 'http://fund.eastmoney.com/400015.html?spm=search' } params = { "callback": "jQuery18303118265739643302_1690164521076", "fundCode": "400015", "pageIndex": "6", "pageSize": "20", "startDate": "", "endDate": "", "_": "1690165052233" } url = 'http://api.fund.eastmoney.com/f10/lsjz' res = requests.get(url, params=params, headers=headers) try: data = res.json() LSJZ = data['Data']['LSJZList'] for i in LSJZ: print("单位净值：", i['DWJZ']) except ValueError: print("无效的JSON数据") 输出的是“无效的JSON数据”

根据你提供的代码，可能是因为获取到的响应数据不是有效的 JSON 格式导致的。可以尝试打印一下获取到的响应内容，看看是否有其他错误信息。

可以修改代码如下：

import requests
import time

headers = {
    'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36',
    'referer': 'http://fund.eastmoney.com/400015.html?spm=search'
}

params = {
    "callback": "jQuery18303118265739643302_1690164521076",
    "fundCode": "400015",
    "pageIndex": "6",
    "pageSize": "20",
    "startDate": "",
    "endDate": "",
    "_": "1690165052233"
}

url = 'http://api.fund.eastmoney.com/f10/lsjz'
res = requests.get(url, params=params, headers=headers)

try:
    data = res.json()
    print(data)  # 打印获取到的响应内容
    LSJZ = data['Data']['LSJZList']
    for i in LSJZ:
        print("单位净值：", i['DWJZ'])
except ValueError:
    print("无效的JSON数据")

通过打印获取到的响应内容，可以更好地了解返回的数据结构，并找出问题所在。