$('.weui-tabbar__item').on('click', function () {
$(this).addClass('weui-bar__item_on').siblings('.weui-bar__item_on').removeClass('weui-bar__item_on'); });
点击该元素触发click事件,使当前元素增加一个类weui-bar__item_on(样式)同时它的兄弟元素去掉weui-bar__item_on类(样式);
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