将执行 document.write 的函数替换为另一个函数

发布于 2024-12-20 02:23:43 字数 549 浏览 1 评论 0原文

我有以下脚本标记，其中函数 A() 执行 document.write()。我无权访问 A()，因为它来自第三方脚本。

//block1
<script type="text/javascript">
    A();
</script>

我没有任何 id/class 钩子到 block1，但我可以像这样在 A() 之前引入函数调用。

<script type="text/javascript">
     B();
     A();
</script>

我希望 B() 函数将 block1 替换为

<script type="text/javascript">
     C();
</script>    
// or keep as is
<script type="text/javascript">
     A();
</script>

这可能吗？我应该如何处理？

原文

I have following script tag where a function A() does a document.write(). I don't have access to A() since it's from third part script.

//block1
<script type="text/javascript">
    A();
</script>

I don't have any id/class hook to block1 but I can introduce a function call before A() like this.

<script type="text/javascript">
     B();
     A();
</script>

I want B() function to replace block1 to

<script type="text/javascript">
     C();
</script>    
// or keep as is
<script type="text/javascript">
     A();
</script>

Is this possible and how should I go about it?

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平安喜乐 2024-12-27 02:23:43

如果您可以在定义 A() 之后、调用它之前插入代码（可能不可能），那么您可以像定义任何代码一样重新定义 A() JavaScript 中的其他函数。

如果不可能，您可以在调用 A() 之前重新定义 document.write，然后在调用 A() 后撤消该操作。例如：

var write = document.write;
document.write = function(s)
{
    //do nothing, or whatever you want
    console.log(s);
}
//then, after A(), just do:
document.write = write;

If you can insert code after A() is defined, but before it is called (might not be possible), then you can redefine A() like you would define any other function in JavaScript.

If that is not possible, you can redefine document.write before A() gets called, and then undo that after A() gets called. For example:

var write = document.write;
document.write = function(s)
{
    //do nothing, or whatever you want
    console.log(s);
}
//then, after A(), just do:
document.write = write;

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