In fact, JavaScript is not a strict J2EE category, but because of its lightweight and fast and powerful client features, we have to give three points for JavaScript.
Here is some of my very limited JavaScript experience. 1) JavaScript is mainly used to capture client events, data table checks, and control the jump guiding page of the page. Each item has enough connotations to excavate, this is not much 2) If the verification is verified, it is generally necessary to make another test to ensure that the data is unanimously and effective (prevent client deliberately shutting up JavaScript check) 3) JavaScript is very powerful, but not universal, for example, In many cases, JS cannot be used back to the previous page (History.back ()), mainly to prevent repeated submission forms, generally use Action to initialize the initial method for the current page (typical example is xxxaction. Do? method = inityyy
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