时间:2021-07-01 10:21:17 帮助过:20人阅读
- <code>var __onfireEvents = {};
- function _bind(eventName, callback, is_one, context) {
- if (typeof eventName !== string_str || typeof callback !== function_str) {
- throw new Error('args: '+string_str+', '+function_str+'');
- }
- if (! hasOwnKey(__onfireEvents, eventName)) {
- __onfireEvents[eventName] = {};
- }
- __onfireEvents[eventName][++__cnt] = [callback, is_one, context];
- return [eventName, __cnt];
- }
- function on(eventName, callback, context) {
- return _bind(eventName, callback, 0, context);
- }
- </code>
第二种方式,同样是将自定义事件存储起来,不同之处是绑定在元素上,是否有必要?这里有什么优势吗?
- <code>$customSubMap = {};
- subscribeEvent = function ( $collection, event_name, fn ) {
- $collection.on( event_name, fn );
- if ( ! $customSubMap[ event_name ] ) {
- $customSubMap[ event_name ] = $collection;
- }
- else {
- $customSubMap[ event_name ]
- = $customSubMap[ event_name ].add( $collection );
- }
- };</code>
第一种方式,直接将自定义事件存放在__onfireEvents中
- <code>var __onfireEvents = {};
- function _bind(eventName, callback, is_one, context) {
- if (typeof eventName !== string_str || typeof callback !== function_str) {
- throw new Error('args: '+string_str+', '+function_str+'');
- }
- if (! hasOwnKey(__onfireEvents, eventName)) {
- __onfireEvents[eventName] = {};
- }
- __onfireEvents[eventName][++__cnt] = [callback, is_one, context];
- return [eventName, __cnt];
- }
- function on(eventName, callback, context) {
- return _bind(eventName, callback, 0, context);
- }
- </code>
第二种方式,同样是将自定义事件存储起来,不同之处是绑定在元素上,是否有必要?这里有什么优势吗?
- <code>$customSubMap = {};
- subscribeEvent = function ( $collection, event_name, fn ) {
- $collection.on( event_name, fn );
- if ( ! $customSubMap[ event_name ] ) {
- $customSubMap[ event_name ] = $collection;
- }
- else {
- $customSubMap[ event_name ]
- = $customSubMap[ event_name ].add( $collection );
- }
- };</code>
看起来第二种可读性更好一点。
其实我觉得两者本质上没区别,就像产品与分类的关系,可以说 {Product1:[Category1, Category2]}也可以说{Category1: [Product1, Product2]}
个人感觉第二