用vscode yarn start启动时出现下面错误时:
<--- Last few GCs --->
[10208:00000249FAEC0DF0] 62449 ms: Scavenge 1379.1 (1423.7) -> 1378.3 (1423.7) MB, 1.8 / 0.0 ms (average mu = 0.197, current mu = 0.217) allocation failure
[10208:00000249FAEC0DF0] 62453 ms: Scavenge 1379.8 (1424.4) -> 1379.1 (1424.4) MB, 1.5 / 0.0 ms (average mu = 0.197, current mu = 0.217) allocation failure
[10208:00000249FAEC0DF0] 62460 ms: Scavenge 1380.5 (1425.1) -> 1379.6 (1425.1) MB, 2.9 / 0.0 ms (average mu = 0.197, current mu = 0.217) allocation failure
<--- JS stacktrace --->
==== JS stack trace =========================================
Security context: 0x03cc34f9e6e1 <JSObject>
0: builtin exit frame: stringify(this=0x03cc34f91a19 <Object map = 00000126990042A9>,0x00b257b026f1 <undefined>,0x00b257b026f1 <undefined>,0x02fe6b365971 <Object map = 0000023BB93EA3D1>,0x03cc34f91a19 <Object map = 00000126990042A9>)
1: arguments adaptor frame: 1->3
2: /* anonymous */(aka /* anonymous */) [00000037F605FAC9] [H:\Git\mmzdf-web\node_modules\webpack\lib\SourceMapDevTool...
FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
1: 00007FF606020EFA v8::internal::GCIdleTimeHandler::GCIdleTimeHandler+4810
2: 00007FF605FFA296 node::MakeCallback+4518
3: 00007FF605FFAC80 node_module_register+2160
4: 00007FF6062909BE v8::internal::FatalProcessOutOfMemory+846
5: 00007FF6062908EF v8::internal::FatalProcessOutOfMemory+639
6: 00007FF6067CE954 v8::internal::Heap::MaxHeapGrowingFactor+11476
7: 00007FF6067C50B7 v8::internal::ScavengeJob::operator=+25543
8: 00007FF6067C362C v8::internal::ScavengeJob::operator=+18748
9: 00007FF6067CC5A7 v8::internal::Heap::MaxHeapGrowingFactor+2343
10: 00007FF6067CC626 v8::internal::Heap::MaxHeapGrowingFactor+2470找到工程目录：node_modules\.bin\umi.cmd文件，替换下面代码，重新启动即可
@IF EXIST "%~dp0\node.exe" (
"%~dp0\node.exe" --max_old_space_size=8192 "%~dp0\..\umi\bin\umi.js" %*
) ELSE (
@SETLOCAL
@SET PATHEXT=%PATHEXT:;.JS;=;%
node --max_old_space_size=8192 "%~dp0\..\umi\bin\umi.js" %*
)