grails - 我需要在Grails中返回 “render”吗？

Question

那需要退货吗？假设它处于 Action 中间。

render(contentType:'text/json', text: ['success': true] as JSON)    
return

Answer 1

如果您不返回，则render之后的任何代码也将被执行，这通常不是您想要的，例如

def someAction = {

  if (someCondition) {
    render view: 'success'
    // if we don't return execution would fall through to the code below
    return  
  }

  log.error 'something went wrong'
  render view: 'error'
}

当然，如果您改用这种样式，则无需返回

def someAction = {

  if (someCondition) {
    render view: 'success'

  } else {    
    log.error 'something went wrong'
    render view: 'error'
  }
}

如果一个 Action 只有一个退出点，则无需在render之后返回

def someAction = {
    render view: 'success'
}

只要记住，如果不返回，就会执行render之后的代码。