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本篇內(nèi)容介紹了“小程序怎么實現(xiàn)計算器功能”的有關(guān)知識,在實際案例的操作過程中,不少人都會遇到這樣的困境,接下來就讓小編帶領(lǐng)大家學習一下如何處理這些情況吧!希望大家仔細閱讀,能夠?qū)W有所成!
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實現(xiàn)模擬手機上的計算器,輸入即可運算
本頁面是做一個計算收款的頁面,如果不需要下面的內(nèi)容可以刪除掉
wxml
{{express}} ={{result}} AC % ÷ 7 8 9 × 4 5 6 - 1 2 3 + 0 . = 人工收款 收款碼收款
js
data: { express: "", //第一行的表達式 result: "0", //第二行的結(jié)果 calc2: { str: "", //臨時字符串 strList: [], //中綴表達式存儲(隊列先進先出) strListP: [], //后綴表達式(隊列先進先出) list: [], //存放運算符的堆棧 (先進后出) count: [], //計算表達式堆棧(先進后出) flag: 0 //表示字符串最后一位是否是運算符號位 }, isqr: false, }, //給所有text或view綁定此事件,同時增加對應(yīng)的自定義屬性值 clickKeyBoard(e) { let that = this; let input = e.currentTarget.dataset.con //獲取每次輸入的內(nèi)容 if (input == "c") { that.handleClear(); } else if (input == "←") { that.handleDelete(); } else { //調(diào)用處理字符串 that.handleInfo(input); } }, //處理本地用戶的輸入操作 handleInfo(input) { if (this.data.calc2.str.length == 0) { //第一次點擊 if (input == "-" || this.checkShuZi(input)) { //為減號 this.addStr(input); } else { return; } } else { if (this.data.calc2.flag == 1) { //說明最后一位是符號 if (this.checkFuHao(input)) { this.data.calc2.str = this.data.calc2.str.substring(0, this.data.calc2.str.length - 1); //去掉最后一位符號,添加最新的符號進去 this.addStr(input); } else { this.addStr(input); } console.log(); } else { this.addStr(input); this.result(); } } this.result(); }, //客戶點擊等號了 result() { //每次點擊等號重新把列表給空 this.data.calc2.strList.length = 0; this.data.calc2.strListP.length = 0; this.data.calc2.list.length = 0; this.data.calc2.count.length = 0; //將表達式變成中綴表達式隊列 this.expressToStrList(this.data.express); console.log(this.data.calc2.strList); //將中綴表達式集合賦值給臨時變量 let tempList = this.data.calc2.strList; this.expressToStrListP(tempList); console.log(this.data.calc2.strListP); //最終的計算 let tempP = this.data.calc2.strListP for (let m in tempP) { if (this.checkFuHao2(tempP[m])) { //不含點號的符號方法判斷 let m1 = this.data.calc2.count[0]; //取出第一個數(shù)據(jù) this.data.calc2.count.shift(); //取出后刪除該數(shù)據(jù) let m2 = this.data.calc2.count[0]; this.data.calc2.count.shift(); // console.log("m1是" +m1); // console.log("m2是" + m2); // console.log("運算符是" + tempP[m]); // console.log("計算結(jié)果是:" + this.countDetail(m2, tempP[m], m1)); this.data.calc2.count.unshift(this.countDetail(m2, tempP[m], m1)); //將計算結(jié)果放到count中 } else { this.data.calc2.count.unshift(tempP[m]) //將數(shù)字壓進去 } } console.log("最終的計算結(jié)果是" + parseFloat(this.data.calc2.count[0]).toFixed(2)); this.setData({ result: this.data.calc2.count[0] }); }, //實際具體計算 countDetail(e1, e2, e3) { let result = 0.0; console.log(e1); console.log(e2); console.log(e3); try { if (e2 == "×") { if (typeof(e1) != "undefined") { result = parseFloat(e1) * parseFloat(e3); } else { result = parseFloat(e3); } } else if (e2 == "÷") { if (typeof(e1) != "undefined") { result = parseFloat(e1) / parseFloat(e3); } else { result = parseFloat(e3); } } else if (e2 == "%") { if (typeof(e1) != "undefined") { result = parseFloat(e1) / parseFloat(e3); } else { result = parseFloat(e3); } } else if (e2 == "+") { if (typeof(e1) != "undefined") { result = parseFloat(e1) + parseFloat(e3); } else { result = parseFloat(e3); } } else { if (typeof (e1) != "undefined") { result = parseFloat(e1) - parseFloat(e3); } else { result = parseFloat(e3); } } } catch (error) { } return result; }, //將中綴表達式集合轉(zhuǎn)變?yōu)楹缶Y表達式集合 expressToStrListP(tempList) { for (let item in tempList) { if (this.checkFuHao2(tempList[item])) { //不含點號的符號方法判斷 if (this.data.calc2.list.length == 0) { this.data.calc2.list.unshift(tempList[item]); //直接添加添加運算符 } else { if (this.checkFuHaoDX(this.data.calc2.list[0], tempList[item])) { for (let x in this.data.calc2.list) { this.data.calc2.strListP.push(this.data.calc2.list[x]); //將運算符都放到listP中 } this.data.calc2.list.length = 0; //循環(huán)完把list置空 this.data.calc2.list.unshift(tempList[item]); //加新元素進去 } else { this.data.calc2.list.unshift(tempList[item]); //直接添加添加運算符 } } } else { this.data.calc2.strListP.push(tempList[item]); //數(shù)字直接加到后綴集合中 } } //循環(huán)完有可能最后一個是數(shù)字了,取到的不是字符,那么運算符里剩余的還的加到listP中 if (this.data.calc2.list.length > 0) { for (let x in this.data.calc2.list) { this.data.calc2.strListP.push(this.data.calc2.list[x]); //將運算符都放到listP中 } this.data.calc2.list.length = 0; //循環(huán)完把list置空 } }, //判斷兩個運算符的優(yōu)先級(m1是list集合中最后加進去的那個元素比較將要進來的元素,如果m1比m2大,彈出list集合到listp中,再把m2加到list中,否則直接將m2加入list) checkFuHaoDX(m1, m2) { if ((m1 == "%" || m1 == "×" || m1 == "÷") && (m2 == "-" || m2 == "+")) { return true; } else { return false; } }, //將字符串表達式變成中綴隊列 expressToStrList(express) { let temp = ""; //定義臨時變量 //將表達式改為中綴隊列 for (let i = 0; i < express.length; i++) { if (i == 0 && express[i] == "-") { temp = temp + express[i]; } else { if (this.checkShuZi2(express[i])) { //如果i是數(shù)字 temp = temp + express[i]; } else { if (temp.length > 0) { if (express[i] == ".") { temp = temp + express[i]; } else { this.data.calc2.strList.push(parseFloat(temp)); temp = ""; this.data.calc2.strList.push(express[i]); } } else { temp = temp + express[i]; } } } } //循環(huán)到最后再看temp中有沒有數(shù)字了,如果有加進來 if (temp.length > 0 && this.checkShuZi(temp.substring(temp.length - 1))) { this.data.calc2.strList.push(parseFloat(temp)); temp = ""; } }, //處理客戶輸入清除鍵 handleClear() { this.data.calc2.str = ""; this.data.calc2.strList.length = 0; this.data.calc2.strListP.length = 0; this.data.calc2.list.length = 0; this.data.calc2.count.length = 0; this.data.calc2.minusFlag = 0; this.setData({ express: "", result: "" }); }, //處理客戶輸入回退鍵 handleDelete() { let that = this; let str = that.data.calc2.str; if (str.length > 0) { str = str.substring(0, str.length - 1); that.data.calc2.str = str; that.setData({ express: str, }); } else { return; } }, //判斷是否是運算符(含點號,用在組織表達式時 .不能重復輸入) checkFuHao(input) { if (input == "-" || input == "+" || input == "÷" || input == "%" || input == "×" || input == ".") { return true; } else { return false; } }, //判斷是否是運算符(不含點號) checkFuHao2(input) { if (input == "-" || input == "+" || input == "÷" || input == "%" || input == "×") { return true; } else { return false; } }, //判斷是否是數(shù)字 checkShuZi(input) { if (input == "0" || input == "1" || input == "2" || input == "3" || input == "4" || input == "5" || input == "6" || input == "7" || input == "8" || input == "9") { return true; } else { return false; } }, //判斷是否是數(shù)字(包含.號,用在表達式轉(zhuǎn)中綴方法中) checkShuZi2(input) { if (input == "0" || input == "1" || input == "2" || input == "3" || input == "4" || input == "5" || input == "6" || input == "7" || input == "8" || input == "9" || input == ".") { return true; } else { return false; } }, //給字符串添加新字符(直接追加 在判斷是否要改變變量flag) addStr(input) { this.data.calc2.str = this.data.calc2.str + input; if (this.checkFuHao(input)) { this.data.calc2.flag = 1; //設(shè)置標記位位1 } else { this.data.calc2.flag = 0; } this.setData({ express: this.data.calc2.str }); },
wxss
/* pages/index/collect-money/collect-money.wxss */ page { background-color: #f8f8f8; } .bottom-handle { height: 100rpx; width: 100%; display: flex; align-items: center; } .fixation-box { position: fixed; bottom: 0; width: 750rpx; } .sweep-code-verification { background: #fff; border-top: 1rpx solid #e3e3e3; width: 220rpx; color: #333; } .artificial-collection, .sweep-code-verification { height: 100%; display: flex; flex-direction: column; align-items: center; font-size: 24rpx; justify-content: center; } .artificial-collection { background: #f3b055; width: 248rpx; color: #fff; } .payment-code { background-image: linear-gradient(203deg, #6f6f6f 0%, #3c3c3c 96%); flex: 1; font-size: 34rpx; color: #fff; text-align: center; line-height: 100rpx; } .sweep-code-verification image { width: 40rpx; height: 40rpx; } .artificial-collection image { width: 40rpx; height: 40rpx; } .calculator-box { background-color: #fff; } .calculator-line { display: flex; align-items: center; } .boxtn { width: 25%; height: 154rpx; border-left: none; display: flex; align-items: center; justify-content: center; } .calculator-box .calculator-line:last-child { border-bottom: none; } .calculator-line { border-bottom: 1rpx solid #dedede; } .btn1, .btn2 { border-right: 1rpx solid #dedede; } .btn2 { width: 50%; } .equal { background: #f3b055; font-size: 61rpx; color: #fff; } .num { font-size: 60rpx; color: #000; } .clear { font-size: 48rpx; color: #f3b055; } .percent { font-size: 60rpx; color: #000; } .charge-content { background: #fff; border-radius: 24rpx; width: 540rpx; display: flex; flex-direction: column; align-items: center; } .charge-title { background: #f3b055; border-radius: 12px 12px 0 0; width: 100%; height: 92rpx; font-size: 34rpx; line-height: 92rpx; text-align: center; color: #fff; } .charge-money { font-size: 60rpx; color: #333; line-height: 84rpx; margin-top: 35rpx; } .charge-propmt { font-size: 28rpx; color: #999; line-height: 42rpx; padding-bottom: 40rpx; } .charge-btn { display: flex; align-items: center; height: 100rpx; border-top: 1rpx solid #ddd; width: 100%; } .charge-cancel, .charge-confirm { flex: 1; text-align: center; line-height: 100rpx; font-size: 34rpx; } .charge-cancel { color: #999; border-right: 1rpx solid #ddd; } .charge-confirm { color: #f3b055; } .successful-content { background: #fff; border-radius: 24rpx; width: 540rpx; display: flex; flex-direction: column; align-items: center; } .success-icon { width: 120rpx; margin-top: 45rpx; height: 120rpx; } .successful-title { font-size: 34rpx; color: #333; line-height: 42rpx; padding: 30rpx 0; font-weight: 600; } .clear-icon { width: 80rpx; height: 80rpx; } .calculate-box { position: fixed; top: 0; bottom: 875rpx; width: 100%; display: flex; flex-direction: column; align-items: flex-end; padding: 0 50rpx; } .result-num { font-size: 88rpx; color: #333; line-height: 124rpx; } .calculate-txt { font-size: 60rpx; color: #333; line-height: 84rpx; margin-top: auto; word-wrap: break-word; text-align: right; word-break: break-all; text-overflow: -o-ellipsis-lastline; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; } .suspend-box{ height: 64rpx; background-color: rgba(0, 0, 0, .5); position: fixed; top: 70rpx; left: 0; color: #fff; display: flex; align-items: center; font-size: 24rpx; padding: 0 20rpx; border-radius: 0 100rpx 100rpx 0; z-index: 9; } .close-suspend{ width: 30rpx; height: 30rpx; }
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