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This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:By clicking the check box on the page, When selected, add an attribute isflag, Delete the attribute isflag when it is not checked, And then a delay of 2 seconds, After 2 seconds, re-judge the ID on the attribute of ISFLAG in all check boxes on the page and store it in an array. Then the proxy function calls the method of the ontology function to send all the ID delayed for 2 seconds to the ontology method at one time. The ontology method can obtain all the ID and send AJAX request to the server. In this way, the request pressure of the server is relatively reduced.1938年6月，武汉会战爆发，抗战局势危急。军统特工谢庚杨自作主张，将长期秘密关押的中共特工孟庆凡“盗出”监狱并射杀江边，抛尸江中，顺水飘到日军阵地。孟庆凡身上携带着一份谢庚杨伪造的假情报，使日本人相信苏联人将会出兵中国东北，进攻武汉的步伐被迫放缓。由于准备仓促，谢庚杨的计划出错，日本特工佐藤坚信这是中国人的阴谋。他亲自到武汉验证情报真伪。死里逃生的孟庆凡从日本人的拷问中，得知了这份计划会对中共造成伤害。他冒死逃离日军营地，返回武汉进行阻止。“谎言计划”被提交到国共高层面前。为了武汉抗战，国共决定携手完成“谎言计划”。为了弥补计划瑕疵，八路军女播音员马小茴被安排与孟庆凡假扮夫妻，两人接受日本人的考验。国共双方情报精英，与日本最精锐的特工人员，围绕着这份谎言计划，在武汉展开了一场搏斗。High-level attacks on classifiers can be divided into the following three types:该片通过“吉祥宝宝”成长故事中的一个个幽默、积极向上的小片段，巧妙地把东莞800多年的饮食文化融入到动画片内，塑造了一个活泼可爱、诚实善良、诙谐幽默的“吉祥宝宝”形象。故事以一个纯真可爱的小孩子的角度，挖掘日常生活中的奇闻趣事。　　生活潦倒的穷鬼阿武（金城武）某次因为赌博被人殴打至重伤后，开始把生命看得一文不值，拿命赌命以八万元代价接了一宗杀人买卖。行动前因为获得八十万意外之财，阿武又爱惜起生命来，请了刚从监狱出来的女杀手卡雯（李若彤）代他完成任务。