下面是 console.log 打印出来的
是22个
Array(22), 只显示20个,length 也是 20
Array(22) [ "serial_number", "project_number", "client_number", "project_name", "Entrusted_unit", "construction", "supervising", "sender", "surveyor", "sender_phone", … ]
0: "serial_number"
1: "project_number"
2: "client_number"
3: "project_name"
4: "Entrusted_unit"
5: "construction"
6: "supervising"
7: "sender"
8: "surveyor"
9: "sender_phone"
10: "surveyor_phone"
11: "weld_name"
12: "weld_id"
13: "area"
14: "overview"
15: "Settlement_method"
16: "Settlement_state"
17: "remark"
18: "create_time"
19: "is_active"
length: 20