-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathBai6.html
195 lines (152 loc) · 5.61 KB
/
Bai6.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Máy tính bỏ túi</title>
<link rel="stylesheet" type="text/css" href="may_tinh.css">
<meta charset="UTF-8">
<title>Tạo máy tính đơn giản bằng javascript</title>
<style>
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
.calculator {
width: 400px;
margin: 10px auto;
}
.calculator__keys {
width: 100%;
/* other necessary CSS */
}
div button {
width: 23%;
height: 30px;
margin-top: 5px;
display: inline-block;
}
div .key--equal {
height: 135px;
float: right;
margin-right: 20px;
}
div button[data-action="clear"] {
}
.calculator__display {
width: 95%;
border: 1px solid black;
padding: 5px 7px;
text-align: right;
border-radius: 4px;
}
.is-depressed {
background-color: #ccc;
}
</style>
</head>
<body>
<div class="calculator">
<div class="calculator__display">0</div>
<div class="calculator__keys">
<button class="key--operator" data-action="add">+</button>
<button class="key--operator" data-action="subtract">-</button>
<button class="key--operator" data-action="multiply">×</button>
<button class="key--operator" data-action="divide">÷</button>
<button>7</button>
<button>8</button>
<button>9</button>
<button class="key--equal" data-action="calculate">=</button>
<button>5</button>
<button>6</button>
<button>4</button>
<button>1</button>
<button>2</button>
<button>3</button>
<button>0</button>
<button data-action="decimal">.</button>
<button data-action="clear">AC</button>
</div>
</div>
<script>
const calculator = document.querySelector('.calculator');
const keys = calculator.querySelector('.calculator__keys');
const display = document.querySelector('.calculator__display');
keys.addEventListener('click', e => {
if (e.target.matches('button')) {
// Do something
const key = e.target;
const action = key.dataset.action;
const keyContent = key.textContent;
const displayedNum = display.textContent;
Array.from(key.parentNode.children)
.forEach(k => k.classList.remove('is-depressed'));
if (!action) {
console.log('number key!');
if (displayedNum === '0' || calculator.dataset.previousKeyType === 'operator') {
display.textContent = keyContent;
} else {
display.textContent = displayedNum + keyContent;
}
calculator.dataset.previousKeyType = 'number';
}
if (
action === 'add' ||
action === 'subtract' ||
action === 'multiply' ||
action === 'divide'
) {
console.log('operator key!');
key.classList.add('is-depressed');
calculator.dataset.previousKeyType = 'operator';
calculator.dataset.firstValue = displayedNum;
calculator.dataset.operator = action;
}
if (action === 'decimal') {
let k =calculator.dataset.previousKeyType;
console.log(k);
if (!displayedNum.includes('.') && k!='operator' ){
display.textContent = displayedNum + '.';
} else if (k == 'operator') {
display.textContent = '0.';
}
calculator.dataset.previousKeyType = 'decimal';
}
if (action === 'clear') {
console.log('clear key!');
display.textContent="0";
calculator.dataset.previousKeyType = 'clear';
}
if (action === 'calculate') {
console.log('equal key!');
const firstValue = calculator.dataset.firstValue;
const operator = calculator.dataset.operator;
const secondValue = displayedNum;
if(firstValue!= undefined && operator !=undefined){
display.textContent = calculate(firstValue, operator, secondValue);
calculator.dataset.previousKeyType = 'calculate';
}
}
}
});
function calculate(firstNum,operator,secondNum){
if(operator === 'add'){
return parseFloat(firstNum) +parseFloat(secondNum) ;
}
if(operator === 'subtract'){
return parseFloat(firstNum) -parseFloat(secondNum) ;
}
if(operator === 'multiply'){
return parseFloat(firstNum) *parseFloat(secondNum) ;
}
if(operator === 'divide'){
return parseFloat(firstNum) /parseFloat(secondNum) ;
}
}
</script>
</head>
<body>
</body>
</html>