Question

When the user leaves the singup part of the page..the global is no longer needed.

我怎么去掉呢?

它以全球名义宣布如下:

var local =  
  {  
  client_validation:1, 
  persistent_element: hide_1  
  };

Answer 1

I m not sure what you mean by "How do I have a global variable that is used for only one of two pages". Global variables are only "global" within the current page. If you navigate to another page they automatically disappear along with everything else on the page you are leaving.

不管怎么说,如果你有某种数据结构,利用记忆,你就可以让停车场收集者收回记忆,如果你删除所有提到结构之处。

就你而言,其中任一发言都应:

global.page_var = null;
// or
delete global.page_var;

(Assuming you don t have other variables or closures with their own references to the same data structure.)

Answer 2

假设你仍然能够查阅变量,这应当考虑到:

if (page_var){
    page_var = null;
}

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