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  • <div><ul><li>Moving adapter parts into separate module, allowing better documentation and move stuff out of <code>lib.rs</code></li><li>Extend documentation for window, adapter and queues (still early...
  • jQuery extend

    2019-06-28 09:46:00
    https://api.jquery.com/jquery.extend/ jQuery.extend( target [, object1 ] [, objectN ] ...Description: Merge the contents of two or more objects together into the first object. target Type: Obje...

    https://api.jquery.com/jquery.extend/

    jQuery.extend( target [, object1 ] [, objectN ] )

    Description: Merge the contents of two or more objects together into the first object.

    • target
      Type: Object
      An object that will receive the new properties if additional objects are passed in or that will extend the jQuery namespace if it is the sole argument.
    • object1
      Type: Object
      An object containing additional properties to merge in.
    • objectN
      Type: Object
      Additional objects containing properties to merge in.

    jQuery.extend( [deep ], target, object1 [, objectN ] )

    • deep
      Type: Boolean
      If true, the merge becomes recursive (aka. deep copy). Passing false for this argument is not supported.
    • target
      Type: Object
      The object to extend. It will receive the new properties.
    • object1
      Type: Object
      An object containing additional properties to merge in.
    • objectN
      Type: Object
      Additional objects containing properties to merge in.

    When two or more object arguments are supplied to $.extend(), properties from all of the objects are added to the target object. Arguments that are null or undefined are ignored.

    If only one argument is supplied to $.extend(), this means the target argument was omitted. In this case, the jQuery object itself is assumed to be the target. By doing this, you can add new functions to the jQuery namespace. This can be useful for plugin authors wishing to add new methods to JQuery.

    Keep in mind that the target object (first argument) will be modified, and will also be returned from $.extend(). If, however, you want to preserve both of the original objects, you can do so by passing an empty object as the target:

    1
    var object = $.extend({}, object1, object2);

     

    The merge performed by $.extend() is not recursive by default;

    if a property of the first object is itself an object or array, it will be completely overwritten by a property with the same key in the second or subsequent object. The values are not merged.

    This can be seen in the example below by examining the value of banana. However, by passing true for the first function argument, objects will be recursively merged.

    Warning: Passing false for the first argument is not supported.

    Undefined properties are not copied. However, properties inherited from the object's prototype will be copied over. Properties that are an object constructed via new MyCustomObject(args), or built-in JavaScript types such as Date or RegExp, are not re-constructed and will appear as plain Objects in the resulting object or array.

    On a deep extend, Object and Array are extended, but object wrappers on primitive types such as String, Boolean, and Number are not. Deep-extending a cyclical data structure will result in an error.

    For needs that fall outside of this behavior, write a custom extend method instead, or use a library like lodash

    https://api.jquery.com/jQuery.fn.extend/

     

    转载于:https://www.cnblogs.com/chucklu/p/11101019.html

    展开全文
  • extend()

    2017-12-19 17:39:10
    extend()简介 extend方法挂载在jQuery和...Query.extend(): Merge the contents of two or more objects together into the first object.(把两个或者更多的对象合并到第一个当中); jQuery.fn.extend():Merge t

    extend()简介

    extend方法挂载在jQuery和jQuery.fn两个不同对象上方法.

    官方给出解释:

    Query.extend(): Merge the contents of two or more objects together into the first object.(把两个或者更多的对象合并到第一个当中);

    jQuery.fn.extend():Merge the contents of an object onto the jQuery prototype to provide new jQuery instance methods.(把对象挂载到jQuery的prototype属性,来扩展一个新的jQuery实例方法)

    简单理解两者区别:
    jQuery.extend(object); 为扩展jQuery类本身,为自身添加新的方法。
    jQuery.fn.extend(object);给jQuery对象添加方法。

    extend()使用

    jQuery.extend(object);

    jQuery.extend( target [, object1 ] [, objectN ] )合并object1, objectN到target对象,如果只有一个参数,则该target对象会被合并到jQuery对象中

    jQuery.extend( [deep ], target, object1 [, objectN ] );深度复制合并对象,第一个参数是boolean类型的true时,将object1, objectN深度复制后合并到target中;

    关于深度复制,是将除null, undefined,window对象,dom对象,通过继承创建的对象外的其它对象克隆后保存到target中;所排除的对象,一是考虑性能,二是考虑复杂度(例如dom及window对象,如果克隆复制,消耗过大,而通过继承实现的对象,复杂程度不可预知,因此也不进行深度复制);

    深度与非深度复制区别是,深度复制的对象中如果有复杂属性值(如数组、函数、json对象等),那将会递归属性值的复制,合并后的对象修改属性值不影响原对象.

    jQuery.fn.extend(object);

     jQuery.fn = jQuery.prototype 即指向jQuery对象的原型链,对其它进行的扩展,作用在jQuery对象上面;一般用此方法来扩展jQuery的对象插件。


    展开全文
  • 1.jQuery.fn.extend用于扩展jQuery.prototype对象,可以采用这种方式为jQuery添加自定义方法 2.jQuery.extend是用于扩展一个类的功能,该函数原型为 jQuery.extend( target [, object1 ] [, objectN ] ) 运行完...

    基础性内容,大神可以略过,O(∩_∩)O~

    1.jQuery.fn.extend用于扩展jQuery.prototype对象,可以采用这种方式为jQuery添加自定义方法


    2.jQuery.extend是用于扩展一个类的功能,该函数原型为

    jQuery.extend( target [, object1 ] [, objectN ] ) ] )

    运行完该函数后,object1以及objectN的特性会被组合到target对象上,因此该函数会修改target对象,为了防止target对象被修改,可以传入{},仅仅使用jQuery.extend的返回值来使用对象merge后产生的类。

    如果该函数仅有一个参数传入时,功能跟jQuery.fn.extend一样,可以用于扩展jQuery原型的方法。

    :上述方法是非递归型的,也就是说object1如果有与objectN相同名字的某个属性,objectN的该属性会整个替换带哦object1的该属性,例子如下:

     
    var object1 = {
    apple: 0,
    banana: { weight: 52, price: 100 },
    cherry: 97
    };
    var object2 = {
    banana: { price: 200 },
    durian: 100
    };
    // Merge object2 into object1
    $.extend( object1, object2 );
    // Assuming JSON.stringify - not available in IE<8
    $( "#log" ).append( JSON.stringify( object1 ) );

    上述程序运行产生的结果为:{"apple":0,"banana":{"price":200},"cherry":97,"durian":100}

    不过jQuery1.1.4之后增加了一个深度版的:

    jQuery.extend( [deep ], target, object1 [, objectN ] )

    来个例子来说明该方法的效果
      
    var object1 = {
    apple: 0,
    banana: { weight: 52, price: 100 },
    cherry: 97
    };
    var object2 = {
    banana: { price: 200 },
    durian: 100
    };
    // Merge object2 into object1, recursively
    $.extend( true, object1, object2 );
    // Assuming JSON.stringify - not available in IE<8
    $( "#log" ).append( JSON.stringify( object1 ) );

    这段程序运行后产生结果:

    {"apple":0,"banana":{"weight":52,"price":200},"cherry":97,"durian":100}


    The End,结束了 

    展开全文
  • ----BULK COLLECT INTO DECLARE TYPE REC_NORMAL IS RECORD( COLUMN_NAME USER_IND_COLUMNS.COLUMN_NAME%TYPE, COLUMN_POSITION USER_IND_COLUMNS.COLUMN_POSITION%TYPE); TYPE NNT_NORMAL IS TA...
    
    ----BULK COLLECT INTO
    DECLARE
      TYPE REC_NORMAL IS RECORD(
        COLUMN_NAME     USER_IND_COLUMNS.COLUMN_NAME%TYPE,
        COLUMN_POSITION USER_IND_COLUMNS.COLUMN_POSITION%TYPE);
      TYPE NNT_NORMAL IS TABLE OF REC_NORMAL;
         L_NNT_NORMAL1 NNT_NORMAL := NNT_NORMAL();
     
          SELECT UIC.COLUMN_NAME, UIC.COLUMN_POSITION
          BULK COLLECT
          INTO L_NNT_NORMAL1
          FROM USER_IND_COLUMNS UIC
         WHERE UIC.INDEX_NAME = 'XIE1MV_STYLE'
          AND NOT EXISTS (SELECT 1
                  FROM USER_IND_EXPRESSIONS UIE
                 WHERE UIC.INDEX_NAME = UIE.INDEX_NAME
                   AND UIC.TABLE_NAME = UIE.TABLE_NAME);
               DBMS_OUTPUT.PUT_LINE(L_NNT_NORMAL1.COUNT);
         END;
         /
    
    
    
    -------EXTEND()
    DECLARE
    TYPE NNT_VAR1 IS TABLE OF NUMBER;
    L_NTT_VAR1 NNT_VAR1:=NNT_VAR1();
    BEGIN
    ---DBMS_OUTPUT.put_line( L_NTT_VAR1.COUNT);
    L_NTT_VAR1.EXTEND();
    L_NTT_VAR1(1):=(888);
    L_NTT_VAR1.EXTEND(3);
    L_NTT_VAR1.EXTEND(3,1);
    DBMS_OUTPUT.put_line( L_NTT_VAR1.COUNT);
    DBMS_OUTPUT.put_line( L_NTT_VAR1.LAST);
    FOR I IN 1..L_NTT_VAR1.COUNT
      LOOP
        DBMS_OUTPUT.PUT_LINE(I||':' ||TO_CHAR(L_NTT_VAR1(I)));
      END LOOP I;
    END;
    /
    ------如果不加EXTEND() 会有什么现象?
    ORA-06532: Subscript outside of limit
    ORA-06512: at line 68
    
    
    -----MULTISET UNION
    DECLARE
       TYPE   NNT_VAR1 IS TABLE OF NUMBER;
       NNT1   NNT_VAR1 := NNT_VAR1(21,31,78);
       NNT2   NNT_VAR1 := NNT_VAR1(10,20,30,40);
       NNT3   NNT_VAR1;
    BEGIN
       NNT3 := NNT1 MULTISET UNION NNT2;
       DBMS_OUTPUT.PUT_LINE(NNT3.COUNT);
    END;
    /
    
    DECLARE
       TYPE   NNT_VAR1 IS TABLE OF NUMBER;
       NNT1   NNT_VAR1 := NNT_VAR1(20,31);
       NNT2   NNT_VAR1 := NNT_VAR1(10,20,30,40);
       NNT3   NNT_VAR1;
    BEGIN
       NNT3 := NNT1 MULTISET UNION DISTINCT NNT2;
       DBMS_OUTPUT.PUT_LINE(NNT3.COUNT);
    END;
    /
    
    DECLARE
       TYPE   NNT_VAR1 IS TABLE OF NUMBER;
       NNT1   NNT_VAR1 := NNT_VAR1();
       NNT2   NNT_VAR1 := NNT_VAR1();
       NNT3   NNT_VAR1;
    BEGIN
       NNT3 := NNT1 MULTISET UNION NNT2;
       DBMS_OUTPUT.PUT_LINE(NNT3.COUNT);
    END;
    /
    
    
    FUNCTION get_ddl ( object_type IN VARCHAR2,
    name IN VARCHAR2,
    schema IN VARCHAR2 DEFAULT NULL,
    version IN VARCHAR2 DEFAULT 'COMPATIBLE',
    model IN VARCHAR2 DEFAULT 'ORACLE',
    transform. IN VARCHAR2 DEFAULT 'DDL') RETURN CLOB;
    
    ----dbms_metadata包中的get_ddl
    
    ----1.表或索引的ddl
    
    SELECT DBMS_METADATA.GET_DDL('TABLE','MV_STYLE','POSUSER') FROM DUAL;
    select dbms_metadata.get_ddl('INDEX','XIE1MV_STYLE','POSUSER') from dual;
    
    ----2.所有表,索引,存储过程的DDL
    
    SELECT DBMS_METADATA.GET_DDL(U.OBJECT_TYPE, u.object_name)
    FROM USER_OBJECTS u
    where U.OBJECT_TYPE IN ('TABLE','INDEX','PROCEDURE');
     
    ------3.所有表空间的DDL
    
    SELECT DBMS_METADATA.GET_DDL('TABLESPACE', TS.tablespace_name)
    FROM DBA_TABLESPACES TS;
    
    ------4.创建用户的DDL
    
    SELECT DBMS_METADATA.GET_DDL('USER',U.username)
    FROM DBA_USERS U;
    

     

    展开全文
  • Jquery extend function

    2018-05-04 22:09:44
    jQuery.extend function introductionJQuery.extend Extension method: Extension method of jQuery extend is usually method when write plugin, 一、jquery prototype method extend(dest,src1,src2,src3.....
  • [jQuery] jquery.extend与jquery.fn.extend的区别? 1、认识jQuery extend()和jQuery.fn.extend() jQuery的API手册中,extend方法...jQuery.extend(): Merge the contents of two or more objects together into the
  • 1、认识jQuery extend()和jQuery.fn.extend()jQuery的API手册中,extend方法挂载在jQuery和jQuery.fn两个不同对象...且看官方给出解释:jQuery.extend(): Merge the contents of two or more objects together into...
  • extend python 列出extend()方法 (List extend() Method) extend() method is used to extend a list, it extends the list by inserting the list of the elements at the end of the current list. The method is ...
  • jQuery extend方法使用及实现

    千次阅读 2016-09-20 18:40:57
    一、jQuery extend方法介绍 jQuery的API手册中,extend方法挂载在jQuery和jQuery.fn两个不同对象上方法,但在jQuery内部代码实现的是相同的,... Merge the contents of two or more objects together into the firs
  • include and extend

    2009-08-05 18:04:02
    extend" adds methods from a module into a class as class methods. "include" adds methods from a module into a class as instance methods. It is quite easy to demonstrate thi...
  • 1、认识jQuery extend()和jQuery.fn.extend() jQuery的API手册中,extend方法挂载在jQuery和jQuery.fn两个不同对象上方法,但在jQuery内部代码实现的是相同的,只是功能却不太一样; 且看官方给出解释: jQuery....
  • jQuery extend()和jQuery.fn.extend()详解
  • Merge the contents of two or more objects together into the first object 把两个或者更多的对象合并到第一个当中 jQuery.fn.extend() Merge the contents of an object onto the jQuery prototype to provide ...
  • jQuery的extend的用法

    2017-06-03 16:40:34
    jQuery 的 API 手册中,extend 方法挂载在 jQuery 和 jQuery.fn 两个不同的对象上,但在 jQuery 内部代码实现的是相同的,只是功能各不相同。 先看看官方给出的解释: jQuery.extend Merge the contents of...
  • jQuery为开发插件提拱了两个方法,分别是:jQuery.fn.extend(object)和jQuery.extend(object) jQuery.extend(object):用于扩展jQuery类本身,为jQuery类添加新的方法,即可以通过 $.functionName()调用的方法。还...
  • 方法介绍jQuery 的 API 手册中,extend 方法挂载在 jQuery 和 jQuery.fn 两...先看看官方给出的解释:jQuery.extend Merge the contents of two or more objects together into the first object. 把两个或者多个对...
  • 详解$.extend()和$.fn.extend()
  • 区别和详解:jQuery extend()和jQuery.fn.extend() 1、认识jQuery extend()和jQuery.fn.extend() jQuery的API手册中,extend方法挂载在jQuery和jQuery.fn两个不同对象上方法,但在jQuery内部代码实现的是相同...
  • jQuery中extend函数详解

    2017-03-13 10:26:43
    这篇文章主要介绍了jQuery中extend函数详解,十分详细...在jQuery的API手册中,我们看到,extend实际上是挂载在jQuery和jQuery.fn上的两个不同方法,尽管在jQuery内部jQuery.extend()和jQuery.fn.extend()是用相同
  • vue.extend的使用

    千次阅读 2020-09-27 00:07:14
    vue.extend常使用场景 当需要在某一个场景内要使用一个新功能,该新功能只是在某组件上作一些新的逻辑新功能即可,选择用Vue.extend。 注意:需要在项目下新建文件vue.config.js module.exports = { runtime...
  • vue.extend的问题

    2021-01-03 21:57:33
    使用Vue.extend时 <template> <div> <div id="mount-point"></div> </div> </template> <script> import Vue from 'vue' export default { mounted() { const ...
  • less笔记-继承(Extend

    万次阅读 2016-09-13 09:45:51
    说明:The extend is either attached to a selector or placed into a ruleset. It looks like a pseudoclass with selector parameter optionally followed by the keyword。 继承被附在选择器后面或放置在规则集...
  • [乐意黎]jQuery.extend()

    2016-11-25 13:26:40
    jQuery.extend( target [, object1 ] [, objectN ] )返回: Object描述: 将两个或更多对象的内容合并到第一个对象。添加的版本: 1.0jQuery.extend( target [, object1 ] [, objectN ] )target类型: Object一个...
  • We can also extend complex selectors into a single element, such as a:hover, .parentClass.childClass and so on. For example: 类选择器不是唯一可以扩展的东西。 我们还可以将复杂的选择器扩展为单个元素,...
  • <div><p>I ran into an issue using the provided example. The other pages use Ember.View.extend(...) which worked for me. So unless there's more to Ember.View.create(...) that I missed and is ...
  • JQuery.extend()详解

    2017-01-07 18:16:00
    JQuery 源码解析 · extend()详解 jQuery.extend( target [, object1 ] [, objectN ] ) jQuery.fn.extend( target [, object1 ] [, objectN ] )

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