How to write the script of JS to realize the effect of picture magnifying glass?

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The complete source code is as follows:

Picture magnifying glass-(yisu.com) * {margin:0px; padding:0px;} # left {width:350px; height:350px; float:left Border:1px solid # cccccc; margin-top:10px; margin-left:10px; position:relative;} # right {border:1px solid # cccccc; float:left Position:relative; width:350px; height:350px; display:none; overflow:hidden; margin-top:10px } # right img {position:absolute;} # small {width:150px; height:150px; background-color:#F90 Border:1px solid # cccccc; opacity:0.3; top:0px; position:absolute; cursor:move; display:none } # left img {width:100%; height:100%;}

$(document) .ready (function (e) {$("# left") .mousemove (move) .mouseenter (function () {$("# small"). Show (); $("# right"). Show ()}) .mouseleave (function () {$("# small"). Hide (); $("# right"). Hide ()})) Function move (e) {var y = e.pageY-$("# left") .offset () .top; if (y > = 75 & & y = 75 & x