fix(field): 解决只读模式默认值为空的情况不走render的问题

[txp1035]

值为空也应该走render

[lgtm-com]

This pull request introduces 1 alert when merging ed71222 into 2227dba - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[codecov]

Codecov Report

Merging #630 (717fcec) into master (ad72be3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #630   +/-   ##
=======================================
  Coverage   96.13%   96.13%           
=======================================
  Files         141      141           
  Lines        3750     3753    +3     
  Branches     1313     1313           
=======================================
+ Hits         3605     3608    +3     
  Misses        141      141           
  Partials        4        4           

Impacted Files	Coverage Δ
packages/field/src/index.tsx	100.00% <100.00%> (ø)

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[chenshuai2144]

标题写一下

fix(组件) ：我干了什么

[txp1035]

啥用例也没有写覆盖率还加了0.01 😃

[chenshuai2144]

你加了个demo，触发一些逻辑

[txp1035]

这里不能进行mode配置还是类型漏掉了啊？

[github-actions]

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