修改作为网页一部分下载的javascript

Modify javascript that was downloaded as part of a web page

本文关键字：下载 javascript 一部分 网页 修改      更新时间：2023-09-26

我想修改作为网页一部分下载的Javascript。

我有这个页面:https://discussions.apple.com/thread/7629335

我想修改函数jspaginate.init。我已经说到这里了:

console.log(window.jspaginate)
Object { data: Object, loading: false, init: jspaginate.init(), update: jspaginate.update(), pushState: jspaginate.pushState(), loadingSequence: jspaginate.loadingSequence(), removeLoading: jspaginate.removeLoading(), updateUI: jspaginate.updateUI(), getData: jspaginate.getData() }
undefined
console.log(window.jspaginate["init"])
function jspaginate.init()
console.log(window.jspaginate["init"].toString())
function (action, last){
    var view = this,
        target, current;
... clipped ...

背景:这个页面包含了大量的javascript。jspaginate函数是从站点服务器下载的。然而，我需要更改函数jspaginate。我无法访问服务器。我想换一份jspaginate。我知道我需要在每次下载时更改功能。

我使用GreaseMonkey插入一些javascript。

用它的新定义重写init函数，如下所示:

window.jspaginate.init = function() { 
   console.log('there you go');
}

下面是我使用的代码。自从我皈依了西班牙语。init初始化为字符串并修改字符串，我必须将字符串转换为函数。我通过eval函数进行了转换。

var debug = 1;
/* Get the string of the function to change */
var stringed = jspaginate["init"].toString();
  if ( debug ) console.log ("--> cloneGotoChange: 'n" + stringed); 
/* Place the added code as the last statement in the function jspaginate["init"]      
   Find the function closing } */
position = stringed.lastIndexOf("}");
/* Change the downloaded javascript */
var newCode = stringed.substr(0, position)
    + " console.log ('"-->  before '" );  cloneGotoUpate(); console.log ('"-->  after '" ); " 
    + stringed.substr(position);
/* Inject the changed code 
   need to use the eval function to make a function assignment instead of a string assignment */
eval( 'jspaginate["init"] =' + newCode);
  if ( debug ) console.log (console.log(window.jspaginate["init"].toString()));
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