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);//
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
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
–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
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
–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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