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In web development, Picture preloading is a common technique, If you set the src attribute directly to the img tag node, If the picture is larger, Or if the network speed is relatively slow, Before the picture is loaded, The picture will be a blank scene for a period of time. This is not good for the user experience, so at this time we can use a loading loading picture as a placeholder to prompt the user that the picture is being loaded before the picture is loaded. After the picture is loaded, we can directly assign a value to the picture. The following code is as follows when we do not use proxy mode to preload pictures:The value of this Token must be random and unpredictable. Due to the presence of Token, the attacker cannot construct another request with a legitimate Token to implement CSRF attack. In addition, when using Token, attention should be paid to the confidentiality of Token, and sensitive operations should be changed from GET to POST as far as possible, and submitted in form or AJAX form to avoid Token disclosure.Private Vector < Observer > vector = new Vector < Observer > ();就要过年了，7岁的小女孩娜西亚的新年愿望就是想买一条长着四条鳍的、白白胖胖的金鱼，可是因为家境贫寒，妈妈始终不肯答应。好不容易在她和哥哥一齐软磨硬泡之下，妈妈答应了这个要求，将家里唯一的500块给了她。BasketballAppearance mode focuses on simplifying interfaces and simplifying the dependency relationship between component systems and external client programs.这个故事，是在人类与嗜血种共存为日常生活的舞台上进行的。