Gradle def 与 ext

使用有什么区别ext.varname and def varname。例如。下面的代码似乎工作相同：

task copyLicenses {
    def outDir = project.buildDir.absolutePath + '/reports/license/'

    doLast {
        copy {
            from 'licenses'
            into outDir
            include '*'
        }

似乎工作原理完全相同

task copyLicenses {
    ext.outDir = project.buildDir.absolutePath + '/reports/license/'

    doLast {
        copy {
            from 'licenses'
            into outDir
            include '*'
        }

Keyword def来自 Groovy，意味着变量有local https://stackoverflow.com/questions/184002/groovy-whats-the-purpose-of-def-in-def-x-0 scope.

Using ext.outDir意味着您添加属性outDir to 额外属性扩展 https://docs.gradle.org/current/dsl/org.gradle.api.plugins.ExtraPropertiesExtension.html，把它想象成项目有一个带有名称的属性图ext，然后您将您的财产放入此地图中以供以后访问。