从PhantomJS调用injectionJS暴露变量[英] Exposing variables from PhantomJS call to injectJS

问题描述

我遵循了从入门页面注入 jQuery 的示例,并且效果很好.我在同一目录中有 jQuery 的本地副本,并执行类似...

if(page.injectJs('jquery.min.js')) {
  page.evaluate(function(){
    //Use jQuery or $ 
  }
}

当我尝试注入自己的脚本时,我无法使用任何功能.假设我有一个名为 myScript.js 的脚本,它只有

function doSomething() {
  // doing something...
}

然后我不能使用 doSomething like...

if(page.injectJs('myScript.js')) {
  console.log('myScript injected... I think');
  page.evaluate(function() {
    doSomething();
  });
} else { 
  console.log('Failed to inject myScript'); 
}

我试过了

window.doSomething = function() {};

document.doSomething = function() {};

也没有运气,以及尝试在随后的 page.evaluate() 中使用 window.doSomething() 或 document.doSomething() 调用它们.

推荐答案

以下对我有用,也许你的应用程序逻辑的其他部分是错误的:

inject.coffee

page = require('webpage').create()

page.onConsoleMessage = (msg) -> console.log msg

page.open "http://www.phantomjs.org", (status) ->
  if status is "success"
    page.includeJs "http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js", ->
      if page.injectJs "do.js"
        page.evaluate ->
          title = echoAndReturnTitle('hello')
          console.log title
        phantom.exit()

do.coffee:

window.echoAndReturnTitle = (arg) ->
  console.log "echoing '#{arg}'"
  console.log $(".explanation").text()
  return document.title

结果:

> phantomjs inject.coffee
echoing 'hello'

            PhantomJS is a headless WebKit with JavaScript API.
            It has fast and native support for various web standards: 
            DOM handling, CSS selector, JSON, Canvas, and SVG.
            PhantomJS is created by Ariya Hidayat.

PhantomJS: Headless WebKit with JavaScript API
<小时>

或者如果您更喜欢 JavaScript(它们是自动生成的,而且有点难看):

`inject.js':

// Generated by CoffeeScript 1.3.1
(function() {
  var page;

  page = require('webpage').create();

  page.onConsoleMessage = function(msg) {
    return console.log(msg);
  };

  page.open("http://www.phantomjs.org", function(status) {
    if (status === "success") {
      return page.includeJs("http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js", function() {
        if (page.injectJs("do.js")) {
          page.evaluate(function() {
            var title;
            title = echoAndReturnTitle('hello');
            return console.log(title);
          });
          return phantom.exit();
        }
      });
    }
  });

}).call(this);

do.js:

// Generated by CoffeeScript 1.3.1
(function() {

  window.echoAndReturnTitle = function(arg) {
    console.log("echoing '" + arg + "'");
    console.log($(".explanation").text());
    return document.title;
  };

}).call(this);

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