这是一项正在进行的工作(计算器和其他一些东西),但我现在要做的是每当你在计算器的结果中键入一些数字时,你按“+” onclick将调用checkValidity,它将确定您输入的内容是整数还是非整数。它会发送一个整数或不整数的警报。我的问题是onclick不会做任何事情。我尝试清除除了警报(“测试”)之外的所有内容的checkValidity函数;它仍然无法正常工作。有人可以解释一下我做错了吗?
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript>">
function checkValidity()
{
var Calculator = document.getElementById("Calculator")
if (Calculator.Result.value === parseInt(test, 10))
{
alert("Integer!");
}
else
{
alert("Not an integer, press C");
}
}
</script>
<form name="Calculator">
First name:
<br>
<input type="text" name="firstname">
<br>
Last name:
<br>
<input type="text" name="lastname">
<br>
Student ID:
<br>
<input type="text" name="ID">
<br>
Biography:
<br>
<textarea maxlength=30 rows="2" cols="30">
</textarea>
<br>
Result:
<table border="1" style="width:100%">
<input type="text" name="Result" size="12">
<tr>
<td><Input type="button" Name="zero" Value="0" OnClick="Calculator.Result.value += '0'"> </td>
<td><Input type="button" Name="one" Value="1" OnClick="Calculator.Result.value += '1'"></td>
<td><Input type="button" Name="two" Value="2" OnClick="Calculator.Result.value += '2'"></td>
<td><Input type="button" Name="three" Value="3" OnClick="Calculator.Result.value += '3'"></td>
</tr>
<tr>
<td><Input type="button" Name="four" Value="4" OnClick="Calculator.Result.value += '4'"></td>
<td><Input type="button" Name="five" Value="5" OnClick="Calculator.Result.value += '5'"></td>
<td><Input type="button" Name="six" Value="6" OnClick="Calculator.Result.value += '6'"></td>
<td><Input type="button" Name="seven" Value="7" OnClick="Calculator.Result.value += '7'"></td>
</tr>
<tr>
<td><Input type="button" Name="eight" Value="8" OnClick="Calculator.Result.value += '8'"></td>
<td><Input type="button" Name="nine" Value="9" OnClick="Calculator.Result.value += '9'"></td>
<td><Input type="button" Name="plus" Value="+" OnClick="checkValidity()"></td>
<td><Input type="button" Name="minus" Value="-" OnClick="Calculator.Result.value += '-'"></td>
</tr>
<tr>
<td><Input type="button" Name="equals" Value="=" OnClick="Calculator.Result.value = eval(Calculator.Result.value)"></td>
<td><Input type="button" Name="divide" Value="/" OnClick="Calculator.Result.value += '/'"></td>
<td><Input type="button" Name="multiply" Value="*" OnClick="Calculator.Result.value += '*'"></td>
<td><Input type="button" Name="clear" Value="C" OnClick="Calculator.Result.value = ''"></td>
</tr>
</table>
<span id="HoursWorkedThisWeek"></span>
<Input type="button" Name="Save" Value="Save" OnClick="Calculator.HoursWorkedThisWeek = Calculator.Result.value">
<Input type="button" Name="Submit" Value="Submit">
</form>
</head>
</html>
答案 0 :(得分:0)
尝试这样做有效
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form id="Calculator" name="Calculator">
First name:
<br>
<input type="text" name="firstname">
<br>
Last name:
<br>
<input type="text" name="lastname">
<br>
Student ID:
<br>
<input type="text" name="ID">
<br>
Biography:
<br>
<textarea maxlength=30 rows="2" cols="30">
</textarea>
<br>
Result:
<table border="1" style="width:100%">
<input type="text" name="Result" size="12">
<tr>
<td><Input type="button" Name="zero" Value="0" OnClick="Calculator.Result.value += '0'"> </td>
<td><Input type="button" Name="one" Value="1" OnClick="Calculator.Result.value += '1'"></td>
<td><Input type="button" Name="two" Value="2" OnClick="Calculator.Result.value += '2'"></td>
<td><Input type="button" Name="three" Value="3" OnClick="Calculator.Result.value += '3'"></td>
</tr>
<tr>
<td><Input type="button" Name="four" Value="4" OnClick="Calculator.Result.value += '4'"></td>
<td><Input type="button" Name="five" Value="5" OnClick="Calculator.Result.value += '5'"></td>
<td><Input type="button" Name="six" Value="6" OnClick="Calculator.Result.value += '6'"></td>
<td><Input type="button" Name="seven" Value="7" OnClick="Calculator.Result.value += '7'"></td>
</tr>
<tr>
<td><Input type="button" Name="eight" Value="8" OnClick="Calculator.Result.value += '8'"></td>
<td><Input type="button" Name="nine" Value="9" OnClick="Calculator.Result.value += '9'"></td>
<td><Input type="button" Name="plus" Value="+" OnClick="checkValid()"></td>
<td><Input type="button" Name="minus" Value="-" OnClick="Calculator.Result.value += '-'"></td>
</tr>
<tr>
<td><Input type="button" Name="equals" Value="=" OnClick="Calculator.Result.value = eval(Calculator.Result.value)"></td>
<td><Input type="button" Name="divide" Value="/" OnClick="Calculator.Result.value += '/'"></td>
<td><Input type="button" Name="multiply" Value="*" OnClick="Calculator.Result.value += '*'"></td>
<td><Input type="button" Name="clear" Value="C" OnClick="Calculator.Result.value = ''"></td>
</tr>
</table>
<span id="HoursWorkedThisWeek"></span>
<Input type="button" Name="Save" Value="Save" OnClick="Calculator.HoursWorkedThisWeek = Calculator.Result.value">
<Input type="button" Name="Submit" Value="Submit">
</form>
<script type="text/JavaScript">
function checkValid()
{
var Calculator = document.getElementById("Calculator")
var test =Calculator[4].value;
if (parseInt(Calculator[4].value) === parseInt(test, 10))
{
alert("Integer!");
}
else
{
alert("Not an integer, press C");
}
}
</script>
</body>
</html>
答案 1 :(得分:0)
您犯了一些小错误导致您的代码无效 我将在工作示例:
之后解释它们
function validate() {
if (Calculator.Result.value == parseInt(Calculator.Result.value,10)) {
alert("Integer!");
} else {
alert("Not an integer, press C");
}
}
&#13;
<body>
<form name="Calculator">
First name: <br /><input type="text" name="firstname" /><br />
Last name: <br /><input type="text" name="lastname" /><br />
Student ID: <br /><input type="text" name="ID" /><br />
Biography: <br /><textarea maxlength=30 rows="2" cols="30"></textarea><br />
Result:
<table border="1" style="width:100%;">
<input type="text" name="Result" size="12" />
<tr>
<td><input type="button" name="zero" value="0" onclick="Calculator.Result.value += '0'" /> </td>
<td><input type="button" name="one" value="1" onclick="Calculator.Result.value += '1'" /></td>
<td><input type="button" name="two" value="2" onclick="Calculator.Result.value += '2'" /></td>
<td><input type="button" name="three" value="3" onclick="Calculator.Result.value += '3'" /></td>
</tr>
<tr>
<td><input type="button" name="four" value="4" onclick="Calculator.Result.value += '4'" /></td>
<td><input type="button" name="five" value="5" onclick="Calculator.Result.value += '5'" /></td>
<td><input type="button" name="six" value="6" onclick="Calculator.Result.value += '6'" /></td>
<td><input type="button" name="seven" value="7" onclick="Calculator.Result.value += '7'" /></td>
</tr>
<tr>
<td><input type="button" name="eight" value="8" onclick="Calculator.Result.value += '8'" /></td>
<td><input type="button" name="nine" value="9" onclick="Calculator.Result.value += '9'" /></td>
<td><input type="button" name="plus" value="+" onclick="validate()" /></td>
<td><input type="button" name="minus" value="-" onclick="Calculator.Result.value += '-'" /></td>
</tr>
<tr>
<td><input type="button" name="equals" value="=" onclick="Calculator.Result.value = eval(Calculator.Result.value)" /></td>
<td><input type="button" name="divide" value="/" onclick="Calculator.Result.value += '/'" /></td>
<td><input type="button" name="multiply" value="*" onclick="Calculator.Result.value += '*'" /></td>
<td><input type="button" name="clear" value="C" onclick="Calculator.Result.value = ''" /></td>
</tr>
</table>
<span id="HoursWorkedThisWeek"></span>
<input type="button" name="Save" value="Save" onclick="Calculator.HoursWorkedThisWeek = Calculator.Result.value" />
<input type="button" name="Submit" value="Submit" />
</form>
</body>
&#13;
<head>
标记内的所有元素。只有<script>
应该在头部(或者更好,在一个单独的JS文件中),所有HTML元素都应该在<body>
标记内。id
,只有name
。因此变量Calculator
(对变量名使用大写的不良做法)什么都没有提到。在您的情况下,您甚至不需要变量,因为您只是直接按名称访问表单,因此我在函数的开头删除了该变量。===
没有用,它太严格了。 ==
会起作用。
以及其他一些可能会或可能不会破坏代码的错误,但这些错误的做法并非如此:
OnClick
应为onclick
(全部小写)。同样适用于Name
和Value
。<input>
是用大写字母写的:<Input>
。<br>
和<input>
需要自己的结束标记,如下所示:<br />
和<input />