优化 util.on()
在特殊情况下的用法问题
Closes: https://gitee.com/layui/layui/issues/I8M528
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@ -427,7 +427,7 @@ layui.define('jquery', function(exports){
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var callbacks = dataCache.callbacks;
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// 根据 attr 记录事件集合
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events = $.extend(true, dataCache.events, events) || {};
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events = dataCache.events[attr] = $.extend(true, dataCache.events[attr], events);
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// 清除事件委托,避免重复绑定
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elem.off(options.trigger, attrSelector, callbacks[attr]);
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