呼叫 personality(0)，可以设定目前 Process 的执行区间(execution domain)， 换个说法就是 Linux 支援了多个执行区间，而我们所设定的执行区间会告诉
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set the process execution domain 设置进程执行域
Normally, an HTTP POST results in the execution of code that creates a resource in the same domain as the request URI and returns a URI for that new resource.
通常，HTTP POST会导致代码的执行，该代码在与请求uri相同的域中创建一个资源，并返回那个新资源的URI。
Only three variables determine the outcome: is the script on the same domain as the main page, is it necessary to preserve execution order, and should the busy indicators be triggered.
只有三个关键变量来决定结果：是否需要跨域，是否需要确保执行顺序，是否需要触发示忙器。
Execution of malicious scripts within a trusted domain or context.
恶意代码在一个受信任的域或上下文中执行。
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