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javascript 内置对象 math,global
学习要点:1.Global对象2.Math对象ECMA-262对内置对象的定义是:“由ECMAScript实现提供的、不依赖宿主环境的对象,这些对象在ECMAScript程序执行之前就已经存在了。”意思就是说,开发人员不必显示地实例化内置对象;因为它们已经实例化了。ECMA-262只定义了两个内置对象:Global和Math。
Date: 2013-08-14 View: 1520
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javascript 基本包装类型
学习要点:1.基本包装类型概述2.Boolean类型3.Number类型4.String类型为了便于操作基本类型值,ECMAScript提供了3个特殊的引用类型:Boolean、Number和String。这些类型与其他引用类型相似,但同时也具有与各自的基本类型相应的特殊行为。实际上,每当读取一个基本类型值的时候,后台就会创建一个对应的基本包装类型的对象,从而能够调用一些方法来操作这些数据。
Date: 2013-08-14 View: 1520
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javascript function 使用注意事项
在ECMAScript中,Function(函数)类型实际上是对象。每个函数都是Function类型的实例,而且都与其他引用类型一样具有属性和方法。由于函数是对象,因此函数名实际上也是一个指向函数对象的指针。学习要点:1.函数的声明方式2.作为值的函数3.函数的内部属性4.函数属性和方法
Date: 2013-08-12 View: 1520
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Oracle PL/SQL DROP function example
This article shows you how to use DROP FUNCTION to delete a function from Oracle database.
Date: 2019-08-11 View: 1520
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Oracle PL/SQL ABS function example
This ABS() function returns absolute value of a number, for example, the absolute value of 5 is 5, and the absolute value of -5 is also 5. In Mathematics, absolute value can be think of as a distance from zero.
Date: 2019-08-11 View: 1520
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Oracle PL/SQL ALTER function example
The ALTER FUNCTION statement explicitly recompile a standalone function. Sometimes, ALTER TABLE on the table being used in function will cause the function becomes INVALID, we need to recompile (alter function) it to make it VALID again.
Date: 2019-08-11 View: 1520
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Oracle PL/SQL CREATE function example
This article will help you to understand how to create a user defined function. It’s also known as stored function or user function.
Date: 2019-08-11 View: 1520
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Spring Boot JDBC Stored Procedure Examples
In this tutorial, we will show you how to use Spring Boot JDBC SimpleJdbcCall to call a stored procedure and stored function from a Oracle database.
Date: 2019-08-11 View: 1520