实现 iFrame自适应高度，原来很简单！

< iframe   id ="iFrame1"  name ="iFrame1"  width ="100%"  onload ="this.height =iFrame1.document .body.scrollHeight"  frameborder ="0"  src ="index.htm" ></ iframe >
看到了吧，关键就在于onload="this.height=iFrame1.document.body.scrollHeight"！