对数运算
下面为效果显示
log
A
B
A
B
脚本说明: 把如下代码加入<body>区域中 <script language="JavaScript"> function anylog(form) { var a = eval(form.a.value); var b = eval(form.b.value); var c = (Math.log(b))/(Math.log(a)) var d = Math.round(1000000*c)/1000000 form.z.value = d } </script> <form> <table border=3 cellspacing=2 cellpadding=5> <tr> <td colspan=2 align=center>log<sub>A</sub>B</td> </tr> <tr> <td align=center><i>A</i></td> <td align=center><i>B</i></td> </tr> <tr> <td align=center><input type=text name=a size=20></td> <td align=center><input type=text name=b size=20></td> </tr> <tr> <td align=center><input type=button value="请看答案" onclick="anylog(this.form)"></td> <td align=center><input type=text name=z size=20></td> </tr> </table> </form>