源代码:
<!DOCTYPE html> <html> <head> <script> function writeText(txt) { document.getElementById("desc").innerHTML=txt; } </script> </head> <body> <img src ="/statics/images/course/planets.gif" width ="145" height ="126" alt="Planets" usemap="#planetmap" /> <map name="planetmap"> <area shape ="rect" coords ="0,0,82,126" onmouseover="writeText('太阳和气体巨星类似木星是太阳系中最大的物体。')" href ="sun.htm" target ="_blank" alt="Sun" /> <area shape ="circle" coords ="90,58,3" onmouseover="writeText('从地球上很难研究水星，因为它太接近太阳。')" href ="/statics/images/course/mercur.htm" target ="_blank" alt="Mercury" /> <area shape ="circle" coords ="124,58,8" onmouseover="writeText('至到1960年，金星经常被认为是地球的孪生妹妹，因为金星是最靠近我们的行星，并且两个行星有很多相似的特点。')" href ="/statics/images/course/venus.htm" target ="_blank" alt="Venus" /> </map> <p id="desc">Mouse over the sun and the planets and see the different descriptions.</p> </body> </html>
运行结果：