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Ext JS学习第九天 Ext基础之 扩展原生的javascript对象
此文来记录学习笔记；
Ext.Object
//Ext对于原生javascript对象的扩展 //Ext.Object //1:chain 把当前传入的对象 当成新创建对象的原型 var obj = { name:‘z3‘, age:10 }; var result = Ext.Object.chain(obj); alert(result.name);//z3 alert(result.age);//10 alert(result.hasOwnProperty(‘name‘)); //false hasOwnProperty()用于判断属性是否是自己的，返回false说明name属性不是自己的，是obj的；obj是result的原型对象
no.2 each( Object object, Function fn, [Object scope] )
//2:each 变量当前对象 然后毁掉函数中暴露出三个属性 key、value、self 如果回调函数返回false则停止迭代 var obj = { name:‘张三‘ , age:20 , sex:‘男‘ }; Ext.Object.each(obj,function(key , value , self){ alert(key + ‘ : ‘ + value); if(age == 20){ return false ; } });
no.3fromQueryString( String queryString, [Boolean recursive] ) : Object
将查询字符串转换回对象。 ...
Ext.Object.fromQueryString("foo=1&bar=2"); // 返回 {foo: 1, bar: 2}Ext.Object.fromQueryString("foo=&bar=2"); // 返回 {foo: null, bar: 2}Ext.Object.fromQueryString("some%20price=%24300"); // 返回 {‘some price‘: ‘$300‘}Ext.Object.fromQueryString("colors=red&colors=green&colors=blue"); // 返回 {colors: [‘red‘, ‘green‘, ‘blue‘]}Ext.Object.fromQueryString( "username=Jacky&"+ "dateOfBirth[day]=1&dateOfBirth[month]=2&dateOfBirth[year]=1911&"+ "hobbies[0]=coding&hobbies[1]=eating&hobbies[2]=sleeping&"+ "hobbies[3][0]=nested&hobbies[3][1]=stuff", true);// 返回{ username: ‘Jacky‘, dateOfBirth: { day: ‘1‘, month: ‘2‘, year: ‘1911‘ }, hobbies: [‘coding‘, ‘eating‘, ‘sleeping‘, [‘nested‘, ‘stuff‘]]}
no.4 getKey( Object object, Object value )
var person = { name: ‘Jacky‘, loves: ‘food‘};alert(Ext.Object.getKey(person, ‘food‘)); // 弹出 ‘loves‘
no.5 toQueryObjects( String name, Object/Array value, [Boolean recursive] ) : Array
将一个name - value对转换为一个对象数组，支持内部结构的转换，对构造查询字符串非常有用。 示例:
var objects = Ext.Object.toQueryObjects(‘hobbies‘, [‘reading‘, ‘cooking‘, ‘swimming‘]);// objects此时等于:[ { name: ‘hobbies‘, value: ‘reading‘ }, { name: ‘hobbies‘, value: ‘cooking‘ }, { name: ‘hobbies‘, value: ‘swimming‘ },];var objects = Ext.Object.toQueryObjects(‘dateOfBirth‘, { day: 3, month: 8, year: 1987, extra: { hour: 4 minute: 30 }}, true); // 递归// objects此时等于:[ { name: ‘dateOfBirth[day]‘, value: 3 }, { name: ‘dateOfBirth[month]‘, value: 8 }, { name: ‘dateOfBirth[year]‘, value: 1987 }, { name: ‘dateOfBirth[extra][hour]‘, value: 4 }, { name: ‘dateOfBirth[extra][minute]‘, value: 30 },];
no.6 getKeys( Object object ) : String[]
获取所有对象的key组成的数组
var values = Ext.Object.getKeys({ name: ‘Jacky‘, loves: ‘food‘}); // [‘name‘, ‘loves‘]
no.7 getSize( Object object ) : Number
获取此对象的所有自有属性的数目
var size = Ext.Object.getSize({ name: ‘Jacky‘, loves: ‘food‘}); // size 等于 2
no.8 getValues( Object object ) : Array
获取给定对象所有的值组成的数组。
var values = Ext.Object.getValues({ name: ‘Jacky‘, loves: ‘food‘}); // [‘Jacky‘, ‘food‘]
no.9 merge( Object destination, Object... object ) : Object
递归的合并任意数目的对象，但是不引用他们或他们的子对象。看栗子
var extjs = { companyName: ‘Ext JS‘, products: [‘Ext JS‘, ‘Ext GWT‘, ‘Ext Designer‘], isSuperCool: true, office: { size: 2000, location: ‘Palo Alto‘, isFun: true }};var newStuff = { companyName: ‘Sencha Inc.‘, products: [‘Ext JS‘, ‘Ext GWT‘, ‘Ext Designer‘, ‘Sencha Touch‘, ‘Sencha Animator‘], office: { size: 40000, location: ‘Redwood City‘ }};var sencha = Ext.Object.merge(extjs, newStuff);// 此时extjs和sencha等于{ companyName: ‘Sencha Inc.‘, products: [‘Ext JS‘, ‘Ext GWT‘, ‘Ext Designer‘, ‘Sencha Touch‘, ‘Sencha Animator‘], isSuperCool: true, office: { size: 40000, location: ‘Redwood City‘, isFun: true }}
no.10 toQueryObjects( String name, Object/Array value, [Boolean recursive] ) : Array
举个栗子：
var objects = Ext.Object.toQueryObjects(‘hobbies‘, [‘reading‘, ‘cooking‘, ‘swimming‘]);// objects此时等于:[ { name: ‘hobbies‘, value: ‘reading‘ }, { name: ‘hobbies‘, value: ‘cooking‘ }, { name: ‘hobbies‘, value: ‘swimming‘ },];var objects = Ext.Object.toQueryObjects(‘dateOfBirth‘, { day: 3, month: 8, year: 1987, extra: { hour: 4 minute: 30 }}, true); // 递归// objects此时等于:[ { name: ‘dateOfBirth[day]‘, value: 3 }, { name: ‘dateOfBirth[month]‘, value: 8 }, { name: ‘dateOfBirth[year]‘, value: 1987 }, { name: ‘dateOfBirth[extra][hour]‘, value: 4 }, { name: ‘dateOfBirth[extra][minute]‘, value: 30 },];
no.11 toQueryString( Object object, [Boolean recursive] ) : String
将一个对象转换成编码的查询字符串
不递归:Ext.Object.toQueryString({foo: 1, bar: 2}); // 返回 "foo=1&bar=2"Ext.Object.toQueryString({foo: null, bar: 2}); // 返回 "foo=&bar=2"Ext.Object.toQueryString({‘some price‘: ‘$300‘}); // 返回 "some%20price=%24300"Ext.Object.toQueryString({date: new Date(2011, 0, 1)}); // 返回 "date=%222011-01-01T00%3A00%3A00%22"Ext.Object.toQueryString({colors: [‘red‘, ‘green‘, ‘blue‘]}); // 返回 "colors=red&colors=green&colors=blue"递归:Ext.Object.toQueryString({ username: ‘Jacky‘, dateOfBirth: { day: 1, month: 2, year: 1911 }, hobbies: [‘coding‘, ‘eating‘, ‘sleeping‘, [‘nested‘, ‘stuff‘]]}, true); // 返回如下字符串(换行和url-decoded是为了便于阅读的目的):// username=Jacky// &dateOfBirth[day]=1&dateOfBirth[month]=2&dateOfBirth[year]=1911// &hobbies[0]=coding&hobbies[1]=eating&hobbies[2]=sleeping&hobbies[3][0]=nested&hobbies[3][1]=stuff
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–Ext.Number
constrain( Number number, Number min, Number max ) : Number
检查给定的数值是否在约束的范围内,如果再范围内就返回此数值。否则，如果大于最大值则返回最大值，如果小于最小值则返回最小值
注意本方法不改变给定的数值本身
randomInt( Number from, Number to ) : Number
返回一个随机数
toFixed( Number value, Number precision )
小数取舍
alert(Ext.Number.toFixed(3.1415926,5));//结果为 3.142
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–Ext.String
capitalize( String string ) : String
返回首字母大写的字符串
trim( String string ) : String
看栗子
var s = ‘ foo bar ‘;alert(‘-‘ + s + ‘-‘); //alerts "- foo bar -"alert(‘-‘ + Ext.String.trim(s) + ‘-‘); //alerts "-foo bar-"
今天就到这里吧，明天继续说Ext.Array，Ext.Function，Ext.Date，Ext.Error；每天进步一点点
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Ext JS学习第九天 Ext基础之 扩展原生的javascript对象