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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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