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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:五哥，你这样说他，叫他听见了，又要跟你吵。Time relays can be divided into AC relays and DC relays according to different power supply requirements, which are respectively used in AC circuits and DC circuits. Time relays can be divided into power-on delay relays and power-off delay relays according to different functions. Time relays can be divided into sealed relays, small relays and micro relays according to their shapes. In addition to the above classification of time relays, time relays also include special types of relays such as resonant relays, stepping relays, proportional relays, etc.少年满江和爷爷生活在一个民风淳朴的渔村，村民们世代靠天吃饭，善良友爱。然而，这里流传着一个关于“海怪”的传说，因而无人敢靠近外海。一天，商人马老爷带着三个手下来到渔村，表面上与村民相处得其乐融融，实则打起了深海宝藏的主意。机缘巧合，少年满江发现，所谓的“海怪”竟然是一只背驼小岛的巨龟，由此展开了一段传奇的海上大冒险……西南形式尽收眼底，各支军队的行进一目了然。Blue Shadow Massachusetts