angularjs 经常使用方法

一 angular的copy和extend

1.angular.extend()
angular.extend():依次将第二个参数及后续的参数的第一层属性(无论是简单的属性仍是对象)拷贝，赋给第一个参数的第一层属性。也就是说，若是是对象，那么引用的是同一个对象，并返回第一个参数对象。
用法1：angular.extend(b,a); 将a拷贝给b
将a拷贝给b
看一个具体的例子：json

var a = { name : 'bijian', address : 'shenzhen', family : { num : 6, amount : '80W' } }; var b = {}; var r = angular.extend(b, a); console.log('a:' + JSON.stringify(a)); console.log('b:' + JSON.stringify(b)); console.log('r:' + JSON.stringify(r)); b.address = 'hanzhou'; b.family.amount = '180W'; console.log('a:' + JSON.stringify(a)); console.log('b:' + JSON.stringify(b)); console.log('r:' + JSON.stringify(r));

结果：数组

a:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} b:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} r:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} a:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"180W"}} b:{"name":"bijian","address":"hanzhou","family":{"num":6,"amount":"180W"}} r:{"name":"bijian","address":"hanzhou","family":{"num":6,"amount":"180W"}}

用法2：angular.extend(b, a, z); 相继将对象a,z拷贝赋给b
举个例子：函数

var a = { name : 'bijian', address : 'shenzhen', family : { num : 6, amount : '80W' } }; var z = { family : { amount : '150W', mainSource : '经营公司' } }; var b = {}; var r = angular.extend(b, a, z); console.log('a:' + JSON.stringify(a)); console.log('b:' + JSON.stringify(b)); console.log('r:' + JSON.stringify(r)); b.address = 'hanzhou'; b.family.amount = '180W'; console.log('a:' + JSON.stringify(a)); console.log('b:' + JSON.stringify(b)); console.log('r:' + JSON.stringify(r));

结果：this

a:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} b:{"name":"bijian","address":"shenzhen","family":{"amount":"150W","mainSource":"经营公司"}} r:{"name":"bijian","address":"shenzhen","family":{"amount":"150W","mainSource":"经营公司"}} a:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} b:{"name":"bijian","address":"hanzhou","family":{"amount":"180W","mainSource":"经营公司"}} r:{"name":"bijian","address":"hanzhou","family":{"amount":"180W","mainSource":"经营公司"}}

2.angular.copy()
angular.extend()是浅拷贝，而angular.copy()是深拷贝。这两个有什么区别呢，看一样的例子。
用法1：angular.copy(a,b); 将对象a中的属性深度拷贝给b
这里a和b不会相互依赖，a和b是彻底脱离关联的spa

var a = { name : 'bijian', address : 'shenzhen', family : { num : 6, amount : '80W' } }; var b = {}; var r = angular.copy(a, b); console.log('a:' + JSON.stringify(a)); console.log('b:' + JSON.stringify(b)); console.log('r:' + JSON.stringify(r)); b.address = 'hanzhou'; b.family.amount = '180W'; console.log('a:' + JSON.stringify(a)); console.log('b:' + JSON.stringify(b)); console.log('r:' + JSON.stringify(r));

结果：code

a:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} b:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} r:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} a:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} b:{"name":"bijian","address":"hanzhou","family":{"num":6,"amount":"180W"}} r:{"name":"bijian","address":"hanzhou","family":{"num":6,"amount":"180W"}}

用法2：var r=angular.copy(a); 将对象a对象的属性深度拷贝给对象r对象

var a = { name : 'bijian', address : 'shenzhen', family : { num : 6, amount : '80W' } }; var r = angular.copy(a); console.log('a:' + JSON.stringify(a)); console.log('r:' + JSON.stringify(r)); a.address = 'hanzhou'; a.family.amount = '180W'; console.log('a:' + JSON.stringify(a)); console.log('r:' + JSON.stringify(r));

结果：blog

a:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} r:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}} a:{"name":"bijian","address":"hanzhou","family":{"num":6,"amount":"180W"}} r:{"name":"bijian","address":"shenzhen","family":{"num":6,"amount":"80W"}}

二 angular判断数据类型

方法	说明
angular.isString()	判断是不是字符串
angular.isObject()	判断是不是对象，注意，它不把null视为对象，数组是对象
angular.isArray()	判断是否为数组
angular.isDtae	判断是不是时间
angular.isNumber	判断是不是数字
angular.isDefined()	判断是否存在
angular.isUndefined()	判断是不是undefined
angular.isFunction()	判断是否为函数
angular.isElement()	判断是不是一个DOM元素或者包装的jQuery元素

var div = angular.element("#findMe"); var str = "1"; var num = 1; var obj = { value: 1 }; var arr = [obj, str]; var date = new Date(); var fn = function(){ // your code
}; var divIsElement = angular.isElement(div);  //divIsElement = true
var strIsString = angular.isString(str);  //strIsString = true
var numIsNumber = angular.isNumber(num);  //numIsNumber = true
var objIsObject = angular.isObject(obj);  //objIsObject = true
var arrIsArray = angular.isArray(arr);  //arrIsArray = true
var dateIsDate = angular.isDate(date);  //dataIsDate = true
var fnIsFunction = angular.isFunction(fn);  //fnIsFunction = true
var nullIsDefined = angular.isDefined(null);  //nullIsDefined = true
var undefinedIsUndefined = angular.isUndefined(undefined);  //undefinedIsUndefined = true

三 angular.forEach()

var array = ['a','b','c']; angular.forEach(array,function(value,i){ console.log(value,i); console.log(this); });

遍历数组，对象也能够。value表示值，i表示索引，而this表示window对象。索引

四 angular的json和字符串转换

angular为咱们提供了原生的JSON.parse()和JSON.stringigy()方法。
angular.fromJson():字符串转json对象
angular.toJson():json对象转字符串element

var json = '{"name":"liSi", "password":"321"}'; var obj = angular.fromJson(json); var obj ={ name:"liSi", password:"321" } var str = angular.toJson(obj, true);

五大小写转换