jQuery获得页面元素的绝对/相对位置即绝对X,Y坐标
获取页面某一元素的绝对X,Y坐标，可以用offset()方法：
<span style="color:#000066; font-weight:bold">var</span> X <span style="color:#339933">=</span> $<span style="color:#009900">(</span><span style="color:#3366CC">'#DivID'</span><span style="color:#009900">)</span>.<span style="color:#660066">offset</span><span style="color:#009900">(</span><span style="color:#009900">)</span>.<span style="color:#660066">top</span><span style="color:#339933">;</span>
<span style="color:#000066; font-weight:bold">var</span> Y <span style="color:#339933">=</span> $<span style="color:#009900">(</span><span style="color:#3366CC">'#DivID'</span><span style="color:#009900">)</span>.<span style="color:#660066">offset</span><span style="color:#009900">(</span><span style="color:#009900">)</span>.<span style="color:#660066">left</span><span style="color:#339933">;</span>
获取相对(父元素)位置:
<span style="color:#000066; font-weight:bold">var</span> X <span style="color:#339933">=</span> $<span style="color:#009900">(</span><span style="color:#3366CC">'#DivID'</span><span style="color:#009900">)</span>.<span style="color:#660066">position</span><span style="color:#009900">(</span><span style="color:#009900">)</span>.<span style="color:#660066">top</span><span style="color:#339933">;</span>
<span style="color:#000066; font-weight:bold">var</span> Y <span style="color:#339933">=</span> $<span style="color:#009900">(</span><span style="color:#3366CC">'#DivID'</span><span style="color:#009900">)</span>.<span style="color:#660066">position</span><span style="color:#009900">(</span><span style="color:#009900">)</span>.<span style="color:#660066">left</span><span style="color:#339933">;</span>
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