预设(Presets)@babel/preset-envES2019json-strings本页总览@babel/plugin-transform-json-strings信息This plugin is included in @babel/preset-env, in ES2019 Examples In JavaScriptconst ex = "before after";// ^ There's a U+2028 char between 'before' and 'after' Out JavaScriptconst ex = "before\u2028after";// ^ There's a U+2028 char between 'before' and 'after'