javascript - What is the difference between these two ways of binding custom events? Which one is better?-PHP Tutorial-php.cn

javascript - What is the difference between these two ways of binding custom events? Which one is better?

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Release： 2016-09-15 11:30:57

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The first way is to store custom events directly in __onfireEvents

<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>

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The second way is to store custom events, but the difference is that they are bound to elements. Is it necessary? Are there any advantages here?

<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>

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Reply content:

The first way is to store custom events directly in __onfireEvents

<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>

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The second way is to store the custom event, but the difference is that it is bound to the element. Is it necessary? Are there any advantages here?

<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>

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It seems that the second one is more readable.

Actually, I think there is essentially no difference between the two, just like the relationship between products and categories. You can say {Product1:[Category1, Category2]} or {Category1: [Product1, Product2]}

My personal feeling is second