Mini Calculator(JavaScript)

最新推荐文章于 2023-10-10 02:51:26 发布

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#javascript #textbox #input #function #table #html

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<html>

<head>

<title>Calculator</title>

//数字验证

function ValidateIsNum(textbox)

{

//如果为空，则默认为０

if(textbox.value == "")

{

textbox.value = 0;

return true;

}

//输入为非数字则清空并提示

if(isNaN(textbox.value))

{

textbox.value = "";

alert("请输入数字");

textbox.focus();

return false;

}

return true;

}

//改变提示

function ChangeTitle(radio)

{

var title1 = document.getElementById("tdTitle1");

var title2 = document.getElementById("tdTitle2");

if(radio.id =="plus")

{

title1.innerText = "请输入加数１：";

title2.innerText = "请输入加数２："

}

if(radio.id == "minus")

{

title1.innerText = "请输入被减数：";

title2.innerText = "请输入减数："

}

if(radio.id == "multiply")

{

title1.innerText = "请输入被乘数：";

title2.innerText = "请输入乘数："

}

if(radio.id == "divide")

{

title1.innerText = "请输入被除数：";

title2.innerText = "请输入除数："

}

//有输入框为空，则Focus，不为空则计算

var text1 = document.getElementById("input1");

var text2 = document.getElementById("input2");

if(text1.value == "")

text1.focus();

else if(text2.valuse == "")

text2.focus();

else

Calc(text1,text2);

}

function Calc(textbox1,textbox2)

{

//验证输入是否合法

if(!ValidateIsNum(textbox1) || !ValidateIsNum(textbox2))

{

return;

}

var operand1 = parseFloat(textbox1.value);

var operand2 = parseFloat(textbox2.value);

var result = 0;

if(document.getElementById("plus").checked == true)

{

result = operand1 + operand2;

}

if(document.getElementById("minus").checked == true)

{

result = operand1 - operand2;

}

if(document.getElementById("multiply").checked == true)

{

result = operand1 * operand2;

}

if(document.getElementById("divide").checked == true)

{

if(operand2 != 0)

{

result = operand1 / operand2;

}

else

{

alert("被除数不可为零");

textbox2.value = "";

textbox2.focus();

}

//输出

document.getElementById("inputResult").value = result;

}

//当focus时如果内容为０，则清空

function ClearWhenFocus(textbox)

{

if(textbox.value == 0)

{

textbox.value = "";

}

</script>

</head>

<body>

<tr>

<td>请选择运算符：</td>

<td>

<input type="radio" checked="true" id="plus" name="operator" onclick="ChangeTitle(this)"></input>+

<input type="radio" id="minus" name="operator" onclick="ChangeTitle(this)"></input>-

<input type="radio" id="multiply" name="operator" onclick="ChangeTitle(this)"></input>*

<input type="radio" id="divide" name="operator" onclick="ChangeTitle(this)"></input>/

</td>

</tr>

<tr>

<td id="tdTitle1">请输入加数1</td>

</tr>

<tr>

<td id="tdTitle2">请输入加数2</td>

</tr>

<tr>

<td>计算结果为：</td>

</tr>

</table>

</body>

</html>