[英]The order of the execution of codes and functions in sails.js and node.js
Please look at the picture below and help me 请看下面的图片帮我
I want to do something like this: 我想做这样的事情:
I want first part A to be fully executed Then run section B, Because in the first part(A) must the file uploaded compeletly to make the uploaded file name assign to global_d variable, i need this variable in part B. 我希望第一部分A被完全执行,然后运行B部分,因为在第一部分(A)中必须完全上传文件以使上载的文件名分配给global_d变量,因此我在B部分中需要此变量。
The next question is how to access a local variable(in this case global_d) from within nested callback functions(in this case part A)? 下一个问题是如何从嵌套回调函数(在本例中为A部分)中访问局部变量(在本例中为global_d)?
Please explain me with examples 请举例说明我
I hope I have expressed my question carefully. 我希望我已经认真表达了我的问题。
thank you 谢谢
The callback function is called when the upload is complete. 上传完成后,将调用回调函数。
Put the call to Book.update
inside it. 把呼叫
Book.update
里面 。
If you want to avoid nesting, the use Promises and see Removing Nested Promises 如果要避免嵌套,请使用Promises ,请参阅删除嵌套的Promises。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.