CasperJS同时请求 [英] CasperJS simultaneous requests

问题描述

让我们说我有一个网址数组。我不想使用thenOpen函数。因为它等待每个先前的url加载，并且减少了加载时间。

  casper.each（hrefs，function（self， href）{
 self.thenOpen（href，function（）{}）; 
 self.then（function（）{
 //选择器
}）; 
  

}）;

您将使用什么方法消费与上述方法相比要少得多吗？在db中创建多个实例存储然后取回效率很高吗...但这令人头疼。并且还希望您也回答一般情况下，当我同时运行同一js文件的多个实例时会遇到问题吗？

解决方案

如果您不关心要在所有打开的URL之间进行同步的行为，则应该为每个URL启动Casper的多个实例。下面是一个示例：

  var casperActions = {
 href1：function（casper）{
 casper。 start（address，function（）{...}）; 
 //测试，而不用于href1 
 casper.run（function（）{...}）; 
}，
 href2：函数（casper）{
 casper.start（address，function（）{...}）; 
 //测试和href2 
不适用的内容casper.run（function（）{...}）; 
}，
 ... 
}; 
 
 ['href1'，'href2'，...]。each（function（href）{
 var casper1 = require（'casper'）。create（）; 
 casperActions [href]（casper）; 
}）； 
  

每个实例都可以独立运行，但可以同时访问多个URL。 / p>

Lets say I have an array of urls. I dont want to use thenOpen function . Since it waits for every previous url to be loaded and it decreases load time .

 casper.each(hrefs,function(self,href){
      self.thenOpen(href,function(){ });
      self.then(function(){
        //  Selectors
     });

});

What methods would u use to spend much less compared to above method ? Would it be efficient to create multiple instances store in the db and then fetch ... but this is alot of headache . And also would like u also to answer in general would I have problems when I run multiple instances of the same js file simultaneously ?

解决方案

If you don't care about synchronizing behavior between all the URLs that you are opening, then you should start multiple instances of casper for each URL. Here is an example:

var casperActions = {
  href1: function (casper) {
    casper.start(address, function() {...});
    // tests and what not for href1
    casper.run(function() {...});
  },
  href2: function (casper) {
    casper.start(address, function() {...});
    // tests and what not for href2
    casper.run(function() {...});
  },
  ...
};

['href1', 'href2', ...].each(function(href) {
  var casper1 = require('casper').create();
  casperActions[href](casper);
});

Each instance would run independently of each other, but it would allow you to hit many URLs simultaneously.

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