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Correction status：qualified
Teacher's comments：
Collection
Collection
计算器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jisuanqi</title>
<style type="text/css" media="screen">
.box {
width: 500px;
height: 200px;
background-color: #efefef;
border: 1px solid lightgray;
text-align: center;
margin: auto;
margin: 20px auto;
color: #636363;
border-radius: 15px;
box-shadow: 2px 2px 2px #999;
}
table {
margin: auto;
/*border: 1px solid red;*/
}
td {
width: 100px;
height: 30px;
padding: 5px 10px;
}
input, select {
width: 100%;
height:100%;
border:none;
text-align: center;
/*background-color: cyan;*/
}
button {
width: 100%;
height: 100%;
border: none;
background-color: skyblue;
color: white;
}
button:hover {
cursor: pointer;
background-color: coral;
width: 105%;
height: 105%;
}
</style>
</head>
<body>
<div class="box">
<table>
<caption>计算器运算表</caption>
<thead>
<tr>
<th> </th>
</tr>
</thead>
<tbody>
<tr>
<td><input type="text" name="opt1" placeholder="第一个数字"></td>
<td><select name="option" >
<option value="null">请选择运算符</option>
<option value="add"> + </option>
<option value="sub"> - </option>
<option value="mul"> * </option>
<option value="div"> / </option>
</select></td>
<td><input type="text" name="opt2" placeholder="第二个数字"></td>
<td><button type="button">计算</button></td>
</tr>
<tr>
<td colspan="2" ><h3>结果:</h3></td>
<td colspan="2"><h3 id="placeholder"></h3></td>
</tr>
</tr>
</tbody>
</table>
</div>
<script type="text/javascript">
//1.获取操作数,按钮与结果占位符
var opt1 = document.getElementsByName('opt1')[0]
var opt2 = document.getElementsByName('opt2')[0]
var opt = document.getElementsByName('option')[0]
var btn = document.getElementsByTagName('button')[0]
var placeholder = document.getElementById('placeholder')
//2.给按钮添加事件,执行计算操作
btn.onclick = function(){
// var data1 = parseFloat(opt1.value)
// var data2 = parseFloat(opt2.value)
if (opt1.value.length == 0 ) {
alert('第一个操作数不能为空')
opt1.focus()
return false
} else if (isNaN(opt1.value)) {
alert('第一个操作数必须为数字')
opt1.focus()
return false
} else if (opt2.value.length == 0) {
alert('第二个操作数不能为空')
opt2.focus()
return false
} else if (isNaN(opt2.value)) {
alert('第二个操作数必须为数字')
opt2.focus()
return false
} else {
var data1 = parseFloat(opt1.value)
var data2 = parseFloat(opt2.value)
}
var option = opt.value
var temp = 0
var flag = ''
var result = ''
switch (option){
case 'null':
alert("请选择操作类型")
opt.focus()
return false
case 'add':
flag = '+'
temp = data1 + data2
break
case 'sub':
flag = '-'
temp = data1 - data2
break
case 'mul':
flag = '*'
temp = data1 * data2
break
case 'div':
flag = '/'
if (data2 == 0) {
alert('除数不能为0,请重新输入')
opt2.focus()
return false
} else {
temp = data1 / data2
}
break
}
placeholder.innerHTML = '<span style="color:coral">'+data1+' '+ flag+' '+ data2+' = '+temp +'</span>'
<!-- var str = '<span style="color:coral">' -->
<!-- str += data1+' '+flag+' '+data2 + ' = ' + temp -->
<!-- str += '</span>' -->
<!-- jieguo.innerHTML = str -->
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
运算结果
总结
手写