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簡易電卓2_使いやすくまとめる
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"use strict"; | |
//========== | |
// JavaScript | |
// Window | |
window.onload = (e)=>{ | |
// CalcManager | |
const cMng = new CalcManager(); | |
// UI | |
const btns = document.getElementsByTagName("button"); | |
for(let btn of btns){ | |
// Buttons | |
btn.addEventListener("click", (e)=>{ | |
const disp = document.getElementById("disp"); | |
disp.textContent = cMng.put(e.target.textContent); | |
}); | |
} | |
} |
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"use strict"; | |
//========== | |
// Utility | |
const ST_VAL1 = 1;// 値1状態 | |
const ST_VAL2 = 2;// 値2状態 | |
class CalcManager{ | |
constructor(){ | |
console.log("CalcManager"); | |
this._state = null; | |
this._val1 = null; | |
this._val2 = null; | |
this._op = null; | |
this.clear(); | |
} | |
clear(){ | |
this._state = ST_VAL1; | |
this._val1 = "0"; | |
this._val2 = ""; | |
this._op = ""; | |
} | |
put(value){ | |
// 数値1状態 | |
if(this._state == ST_VAL1){ | |
if(this.isNumeric(value)){// 数値の場合 | |
this._val1 += value; | |
if(1 < this._val1.length && this._val1[0] == 0){ | |
this._val1 = this._val1.substr(1); | |
} | |
} | |
if(this.isFlg(value)){// +-反転の場合 | |
this._val1 = this.changeFlg(this._val1);// 符号反転 | |
} | |
if(this.isOperator(value)){// 演算子の場合 | |
this._op = value; | |
this._state = ST_VAL2;// 数値2状態へ | |
} | |
if(this.isClear(value)){// Cボタン | |
this.clear(); | |
} | |
if(this._state == ST_VAL1) return this._val1; | |
if(this._state == ST_VAL2) return (this._val2.length<=0)?this._val1:this._val2; | |
return null; | |
} | |
// 数値2状態 | |
if(this._state == ST_VAL2){ | |
if(this.isNumeric(value)){// 数値の場合 | |
this._val2 += value; | |
if(1 < this._val2.length && this._val2[0] == 0){ | |
this._val2 = this._val2.substr(1); | |
} | |
} | |
if(this.isFlg(value)){// +-反転の場合 | |
if(this._val2.length <= 0){ | |
this._val1 = this.changeFlg(this._val1); | |
}else{ | |
this._val2 = this.changeFlg(this._val2); | |
} | |
} | |
if(this.isOperator(value)){// 演算子の場合 | |
if(this._val2.length <= 0){ | |
this._op = value; | |
}else{ | |
this._val1 = this.calc(this._val1, this._val2, this._op).toString();// 計算処理 | |
this._val2 = ""; | |
this._op = value; | |
} | |
} | |
if(this.isEqual(value)){// =の場合 | |
this._val1 = this.calc(this._val1, this._val2, this._op).toString();// 計算処理 | |
this._val2 = ""; | |
this._op = ""; | |
this._state = ST_VAL1;// 数値1状態へ | |
} | |
if(this.isClear(value)){// Cボタン | |
this.clear(); | |
} | |
if(this._state == ST_VAL1) return this._val1; | |
if(this._state == ST_VAL2) return (this._val2.length<=0)?this._val1:this._val2; | |
return null; | |
} | |
return null; | |
} | |
calc(v1, v2, op){ | |
const n1 = parseInt(v1); | |
const n2 = parseInt(v2); | |
if(op == "+") return n1 + n2; | |
if(op == "-") return n1 - n2; | |
if(op == "*") return n1 * n2; | |
if(op == "/" && n2 != 0) return n1 / n2; | |
return 0; | |
} | |
isNumeric(n){ | |
return !isNaN(n); | |
} | |
isOperator(op){ | |
if(op == "+") return true; | |
if(op == "-") return true; | |
if(op == "*") return true; | |
if(op == "/") return true; | |
return false; | |
} | |
isEqual(e){ | |
return e == "="; | |
} | |
isClear(c){ | |
return c == "C"; | |
} | |
isFlg(op){ | |
if(op == "+/-") return true; | |
return false; | |
} | |
changeFlg(n){ | |
let num = ""; | |
if(this.isNumeric(n[0])){ | |
num = "-" + n; | |
}else{ | |
num = n.substr(1); | |
} | |
return num; | |
} | |
} |
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="UTF-8"> | |
<link rel="shortcut icon" href="./images/favicon.ico"> | |
<!-- Stylesheet --> | |
<link href="./css/custom.css" rel="stylesheet" type="text/css"/> | |
<!-- JavaScript --> | |
<script src="./js/custom_utility.js" defer></script> | |
<script src="./js/cutom_main.js" defer></script> | |
</head> | |
<body> | |
<table> | |
<tr> | |
<td><button>C</button></td> | |
<td colspan="3" id="disp"></td> | |
</tr> | |
<tr> | |
<td><button>7</button></td> | |
<td><button>8</button></td> | |
<td><button>9</button></td> | |
<td><button>+</button></td> | |
</tr> | |
<tr> | |
<td><button>4</button></td> | |
<td><button>5</button></td> | |
<td><button>6</button></td> | |
<td><button>-</button></td> | |
</tr> | |
<tr> | |
<td><button>1</button></td> | |
<td><button>2</button></td> | |
<td><button>3</button></td> | |
<td><button>*</button></td> | |
</tr> | |
<tr> | |
<td><button>0</button></td> | |
<td><button>+/-</button></td> | |
<td><button>=</button></td> | |
<td><button>/</button></td> | |
</tr> | |
</table> | |
</body> | |
</html> |
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