This callback function is invoked several times during the life cycle of the Ajax request whose current state can be obtained from the readyState property.
此回调函数在 Ajax 请求的整个生命周期进行了多次调用，而请求的当前状态可从 readyState 属性获得。
Function life cycle is divided into a stage of creation and a stage of activation (call). Let's consider them in detail.
函数的生命周期分为创建和激活阶段(调用的时候)。下面我们详细的讨论它。
This paper explains the data management base software, LCIVF of life cycle detailed list analysis from function, structure and realize.
对研制的生命周期清单分析数据管理库软件LCIVF，从功能、结构及实现方面进行了全面阐述；
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