什么是 JSONP，为什么创建它? [英] What is JSONP, and why was it created?
问题描述
我了解 JSON，但不了解 JSONP.维基百科关于 JSON 的文档 是(曾经)JSONP 的顶级搜索结果.它是这样说的:
I understand JSON, but not JSONP. Wikipedia's document on JSON is (was) the top search result for JSONP. It says this:
JSONP 或带填充的 JSON"是一个 JSON 扩展，其中前缀被指定为调用本身的输入参数.
JSONP or "JSON with padding" is a JSON extension wherein a prefix is specified as an input argument of the call itself.
嗯?什么叫?这对我来说没有任何意义.JSON 是一种数据格式.没有电话.
Huh? What call? That doesn't make any sense to me. JSON is a data format. There's no call.
第二个搜索结果来自一个名叫
The 2nd search result is from some guy named Remy, who writes this about JSONP:
JSONP 是脚本标记注入，将来自服务器的响应传递给用户指定的函数.
JSONP is script tag injection, passing the response from the server in to a user specified function.
我可以理解这一点，但仍然没有任何意义.
I can sort of understand that, but it's still not making any sense.
那么什么是 JSONP?为什么创建它(它解决了什么问题)?我为什么要使用它?
So what is JSONP? Why was it created (what problem does it solve)? And why would I use it?
附录:我刚刚为 JSONP 创建了一个新页面 在维基百科上；它现在根据 jvenema 的回答对 JSONP 进行了清晰而全面的描述.
Addendum: I've just created a new page for JSONP on Wikipedia; it now has a clear and thorough description of JSONP, based on jvenema's answer.
推荐答案
其实并不复杂...
假设您在域 example.com 上，并且您想向域 example.net<发出请求/强>.为此，您需要跨域边界，这是大多数浏览器领域的禁忌.
Say you're on domain example.com, and you want to make a request to domain example.net. To do so, you need to cross domain boundaries, a no-no in most of browserland.
绕过此限制的一项是
