要完成此效果需要两个步骤
第一步：把如下代码加入到<head>区域中
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function sqRt(form) {
var number = form.num.value;
var ans = Math.sqrt(number);
form.answer.value = ans;
}
function sqIt(form) {
var number = form.num.value;
var ans = eval(number * number);
form.answer.value = ans;
}
// End -->
</script>
第二步：把如下代码加入到<body>区域中
<center>
<form>
<table border=1>
<tr>
<td>
<input type=text name=num size=10>
</td>
<td>
<input type=button value="开 方" onClick="sqRt(this.form)">
<br>
<input type=button value="平 方" onClick="sqIt(this.form)">
</td>
<td>
<input type=text name=answer size=15><br>
<input type=button value="移到左框" onClick="this.form.num.value = this.form.answer.value">
</td>
</tr>
</table>
</form>
</center>
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