layui避免重复添加tabs

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//layui避免重复添加tabs
var exist=$("li[lay-id='"+only_id+"']").length;
if(exist<1){
    _layUIUtils.layUI_add_tabs(target_index_filter,title,url,only_id);
}
_layUIUtils.layUI_change_tabs(target_index_filter, only_id);