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The first scheme is to use the general coding method to realize the preloading technology of the picture. First, create the imgNode element, Then when the method myImage.setSrc is called, a preloaded picture is given to the picture first, and when the picture is loaded, the img element is assigned a value. The second scheme is implemented by using proxy mode. MyImage function is only responsible for creating img elements, proxy function ProxyImage is responsible for setting loading pictures for the picture, and when the picture is really loaded, myImage.setSrc method in myImage is called to set the path of the picture. The advantages and disadvantages between them are as follows:故事以北宋著名词人柳三变(柳永)的生平为线索，展现了宋初年间一场关乎国家和民族命运的惊心动魄的政治斗争，其间还穿插了他和五位红颜知己的爱恨缠绵。如果，因为你的离去，让我名正言顺地拥有淼淼，我宁愿不要。"They will never give up halfway, try different ports, different protocols or carry out attacks from new sources. In short, they will never give up until they reach their goals. Tactics are always changing," he pointed out. "Enterprise users must understand and prepare for this fast and flexible feature of rivals."我的名字是佐助。So this is a weightlifting squat?爱情,从来行动大于言语威伦,一个出生在情人节的年轻人,却从来不知道爱情——甚至连他父母的爱都不知道。他遇到了一个对他表现出同情和温柔的人