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<!DOCTYPE html> <html> <head> <script> function writeText(txt) { document.getElementById("desc").innerHTML = txt; } </script> </head> <body> <img src ="planets.gif" width ="145" height ="126" alt="行星"usemap="#planetmap" /> <map name="planetmap"> <area shape ="rect" coords ="0,0,82,126" onmouseover="writeText('太阳和像木星这样的气态巨行星是迄今为止我们太阳系中最大的天体。')" href ="sun.htm" target ="_blank" alt="太阳" /> <area shape ="circle" coords ="90,58,3" onmouseover="writeText('水星行星很难从地球上研究，因为它总是离太阳很近。')" href ="mercur.htm" target ="_blank" alt="水星" /> <area shape ="circle" coords ="124,58,8" onmouseover="writeText('直到 1960 年代，金星通常被认为是地球的孪生姐妹，因为金星是离我们最近的行星，而且这两颗行星似乎有许多共同特征。')" href ="venus.htm" target ="_blank" alt="金星" /> </map> <p id="desc">将鼠标悬停在太阳和行星上，查看不同的描述。</p> </body> </html>