模板包含了静态的文本，例如添加的标签的名字，以及变量。
Templates contain static text, such as the name of the tag to be added, as well as variables.
这个函数把对AJAX请求的文本响应读入一个变量，并通过修改DOM在登录页面中添加此文本。
This function is reading the text response to the AJAX request into a variable and adding the text into our login page by changing the DOM.
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