Question

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。我已经走到了这一步：

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：这个页面包含很多javascript。从站点服务器下载jspaginate函数。不过，我需要更改函数jspaginate。我无法访问服务器。我想更改我的jspaginate副本。我知道每次下载都需要更改功能。

我使用GreaseMonkey插入一些javascript。

Answer 1

只需使用新定义覆盖init函数，如下所示：

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

Answer 2

这是我使用的代码。由于我已将jspaginate.init转换为字符串并修改了字符串，因此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()));

修改作为网页一部分下载的javascript

2 个答案: