$.ajaxSetup为将来的Ajax请求设置默认值.

Its use is not recommended as suggested in the JQuery documentation.

无论如何,因为它设置了将来调用的默认值,它必须在所有依赖于这些默认值的ajax调用之前执行.例如,如果您没有提到调用的url,则$ajaxSetup中配置的默认URL将是调用的url.如果您所做的调用取决于那些默认值,那么此代码

self.authenticate = function () {

self.token = sessionStorage.getItem(tokenKey);

var headers = {};

if (self.token) {

headers.Authorization = 'Bearer ' + self.token;

$.ajaxSetup({

headers: headers

});

}

}

必须在进行以下调用之前执行.

self.getUsers = function () {

$.get("../API/Users/GetUsers/");

}

现在检查一下

*************** Plunker for answer ****************

在那个plunker中,按F12键进入开发者控制台中的网络选项卡,然后检查$.ajax()和$.get()进行的调用中的标题.

我在观察到的那个(要点读)点,

>如果调用是$.ajax(),那么标题显示,并且调用的url是$.ajaxSetup中提到的url

>如果调用是$.get(),那么标题不显示,调用的url是plunker url,意味着它将是http：// MySite / etc.

$.ajax() is the most configurable one, where you get fine grained

control over HTTP headers and such. You’re also able to get direct

access to the XHR-object using this method. Slightly more fine-grained

error-handling is also provided. Can therefore be more complicated and

often unecessary, but sometimes very useful. You have to deal with the

returned data yourself with a callback.

$.get() is just a shorthand for $.ajax() but abstracts some of the

configurations away, setting reasonable default values for what it

hides from you. Returns the data to a callback. It only allows

GET-requests so is accompanied by the $.post() function for similar

abstraction, only for POST

有关更多信息

如果你愿意,可以测试一下.

$.ajax()调用的图片

$.get()调用的图片

因此,如果要设置标题,只需使用$.ajax()而不是$.get()

希望这可以帮助 ：)