在导出的绑定属性中，在 Connection 选项卡的高级设置下，对函数选择器进行了定义，如图 1 所示。
The function selector is defined in the binding properties of the export, under the Advanced settings of the Connection tab, as shown in Figure 1.
在成功完成了的请求上调用abort不起任何作用，并且仅当浏览器收到一个对旧请求的延时响应的情况下，onreadystatechange才被设置为一个空函数。
Calling abort on a successfully completed request won't do anything and onreadystatechange is set to an empty function just in case the browser gets a delayed response for an old request.
在这种情况下，需要覆盖XMLHttpRequest实例的onreadystatechange函数以便您可以为这个异步请求设置一个callback函数。
In such cases, you need to override the onreadystatechange function of the XMLHttpRequest instance so that you can set a callback function for the asynchronous request.
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