PhantomJsの例が機能しませんか？

Question

誰かが下のリンクの例がうまくいかない理由を教えてもらえますか？私は12秒にタイムアウトを加えました。いつも私に=> console.log（ "'waitFor（）'タイムアウト"）;

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

私は例をコピーしたが、動作していません。私はそれを 'phantomjs'を使って実行しようとしています。誰かが私に何かの理由を教えてもらえますか？

PhantomJSバージョン：2.1.1

Answer 1

私は、このスクリプトを変更した、と今では働いています：

/** 
* 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'); 
});