PhantomJs示例不工作？

Question

有人可以告訴我爲什麼在下面的鏈接的例子不起作用。我甚至將超時時間增加到了12秒。總是顯示我=> console.log（「'waitFor（）'timeout」）;

鏈接：https://github.com/ariya/phantomjs/blob/master/examples/waitfor.js

我複製的例子，但沒有工作。我正在嘗試使用'phantomjs'來運行它。有人可以請指導我可能的原因是什麼？

PhantomJS版本：2.1.1

Answer 1

我已經修改了這個劇本，而現在它的工作：

/** 
* Wait until the test condition is true or a timeout occurs. Useful for waiting 
* on a server response or for a ui change (fadeIn, etc.) to occur. 
* 
* @param testFx javascript condition that evaluates to a boolean, 
* it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or 
* as a callback function. 
* @param onReady what to do when testFx condition is fulfilled, 
* it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or 
* as a callback function. 
* @param timeOutMillis the max amount of time to wait. If not specified, 3 sec is used. 
*/ 

"use strict"; 
function waitFor(testFx, onReady, timeOutMillis) { 
    var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 5000, //< Default Max Timout is 3s 
     start = new Date().getTime(), 
     condition = false, 
     interval = setInterval(function() { 
      if ((new Date().getTime() - start < maxtimeOutMillis) && !condition) { 
       // If not time-out yet and condition not yet fulfilled 
       condition = (typeof(testFx) === "string" ? eval(testFx) : testFx()); //< defensive code 
      } else { 
       if(!condition) { 
        // If condition still not fulfilled (timeout but condition is 'false') 
        console.log("'waitFor()' timeout"); 
        phantom.exit(1); 
       } else { 
        // Condition fulfilled (timeout and/or condition is 'true') 
        console.log("'waitFor()' finished in " + (new Date().getTime() - start) + "ms."); 
        typeof(onReady) === "string" ? eval(onReady) : onReady(); //< Do what it's supposed to do once the condition is fulfilled 
        clearInterval(interval); //< Stop this interval 
       } 
      } 
     }, 250); //< repeat check every 250ms 
}; 


function click(sel){var event=document.createEvent('MouseEvents');event.initMouseEvent('click',1,1,window,1,0,0,0,0,0,0,0,0,0,null);document.querySelector(sel).dispatchEvent(event);} 
var page = require('webpage').create(); 

// Open Twitter on 'sencha' profile and, onPageLoad, do... 
page.open("https://twitter.com/sencha", function (status) { 
    // Check for page load success 
    if (status !== "success") { 
     console.log("Unable to access network"); 
    } else { 
     page.evaluate(function(click) {click('a[id="signin-link"]');},click)//,click will be available 
     // Wait for 'signin-dropdown' to be visible 
     waitFor(function() { 
      // Check in the page if a specific element is now visible 
      return page.evaluate(function() { 
       return $("div#signin-dropdown").is(":visible"); 
      }); 
     }, function() { 
      console.log("The sign-in dialog should be visible now."); 
      phantom.exit(); 
     }); 
    } 
page.render('sencha.png'); 
});