发送keydown事件在PhantomJS中不起作用

Question

我试着用网页的代码，当我们按下keydown时，它的内容动态加载。 （如脸书）

目标是获得所有净流量并将其打印到控制台。

var page = require('webpage').create(), 
    system = require('system'), 
    address; 

if (system.args.length === 1) { 
    console.log('Usage: netlog.js <some URL>'); 
    phantom.exit(1); 
} else { 
    address = system.args[1]; 

    page.onLoadFinished  = function(req) { 
     console.log('requested: ' + JSON.stiringify(req, undefined, 4)); 

    }; 
    page.open(url, function() { 
     page.sendEvent('keypress', page.event.key.keydown); 
    }); 
    page.onResourceRequested = function (req) { 
     console.log('requested: ' + JSON.stringify(req, undefined, 4)); 
    }; 

    page.onResourceReceived = function (res) { 
     console.log('received: ' + JSON.stringify(res, undefined, 4)); 
    }; 


    page.open(address, function (status) { 
     if (status !== 'success') { 
      console.log('FAIL to load the address'); 
     } 
     phantom.exit(); 
    }); 

} 

Answer 1

首先，PhantomJS是异步的。你同时打开两页。当第二页page.open()第一页的加载被中止时。这意味着您的page.sendEvent()调用永远不会执行。

如果你想看到的事件是否是做什么的，你需要让页面加载，并做一些动作后等待一点点，看看是否有请求：

if (system.args.length === 1) { 
    console.log('Usage: netlog.js <some URL>'); 
    phantom.exit(1); 
} else { 
    address = system.args[1]; 

    page.onResourceRequested = function (req) { 
     console.log('requested: ' + JSON.stringify(req, undefined, 4)); 
    }; 

    page.onResourceReceived = function (res) { 
     console.log('received: ' + JSON.stringify(res, undefined, 4)); 
    }; 


    page.open(address, function (status) { 
     if (status !== 'success') { 
      console.log('FAIL to load the address'); 
      phantom.exit(1); 
     } 

     page.sendEvent('keypress', page.event.key.keydown); 

     setTimeout(function(){ 
      phantom.exit(); 
     }, 1000); 
    }); 
}