WHY

Microsoft Windows [版本 10.0.17134.48]
(c) 2018 Microsoft Corporation。保留所有权利。

C:\Users\WHY>cd /d D:\jq

D:\jq>set BK_V={"timestamp":"20180606173933","metric":{"name":"wangchuan"}}

D:\jq>for /f "tokens=*" %i in ('set /p"=%BK_V%"^<nul ^| jq -c ".metric |= .+ {\"age\":\"18\"}"') do echo %i

D:\jq>echo {"timestamp":"20180606173933","metric":{"name":"wangchuan","age":"18"}}
{"timestamp":"20180606173933","metric":{"name":"wangchuan","age":"18"}}

D:\jq>