dojo 官方翻译 dojo/aspect

转载于 2019-01-08 02:09:59 发布 · 156 阅读

本文详细介绍了Dojo框架中的切面编程技术，包括after、before和around三种方法的使用方式，展示了如何在目标方法前后插入自定义逻辑，实现对已有功能的增强或修改。

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官网地址：http://dojotoolkit.org/reference-guide/1.10/dojo/aspect.html

after()

定义：after(target, methodName, advisingFunction, receiveArguments);

意义：在target的methodName方法之后执行advisingFunction方法。

define(["dojo/aspect"], function(aspect){
  aspect.after(dojo, "xhr", function(deferred){
    // this is called after any dojo.xhr call
  });
  // this will execute the original dojo.xhr method and then our advising function
  dojo.xhr("GET", {...});
});

dojo.require("dojo.aspect");
dojo.aspect.after(dojo, "xhr", function(response){
  ...
});

before()

定义：before(target, methodName, advisingFunction);

意义：在target的methodName方法之前执行adviseingFunction。

define(["dojo/aspect"], function(aspect){
  aspect.before(dojo, "xhr", function(method, args){
    // this is called before any dojo.xhr call
    if(method == "PUT"){
      // if the method is PUT, change it to a POST and put the method in the parameter string
      args.url += "?x-method=PUT";
      // return the new args
      return ["POST", args];
    }
  });
  // this will execute the original our advising function and then dojo.xhr
  dojo.xhr("PUT", {...});
});

around()

定义：around(target, methodName, advisingFactory);

define(["dojo/aspect"], function(aspect){
  aspect.around(dojo, "xhr", function(originalXhr){
    return function(method, args){
      // doing something before the original call
      var deferred = originalXhr(method, args);
      // doing something after the original call
      return deferred;
    }
  });
  dojo.xhr("PUT", {...});
});