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const app = getApp()
Page({
data: {
operators: ['AC', 'DEL', '%', '/', '7', '8', '9', '×', '4', '5', '6', '+', '1', '2', '3', '-', '0', '.'],
res: '=',
expression: '0',
},
clearAll() {
this.setData({
expression: '0',
result: ''
})
},
click: function (event) {
const val = event.target.dataset.value;
if (val == 'AC') {
this.clearAll();
} else if (val == 'DEL') {
if (this.data.expression != '0') {
const res = this.data.expression.substr(0, this.data.expression.length - 1);
this.setData({
expression: res
})
}
} else {
var len = this.data.expression.length;
var s = this.data.expression.substring(len - 1, len);
if ((this.checkOperator(s)) && this.checkOperator(val)) {
const res = this.data.expression.substr(0, this.data.expression.length);
this.setData({
expression: res
})
} else {
if ((this.data.expression == '0') && (val == '.')) {
this.setData({
expression: this.data.expression + String(val)
})
} else {
this.setData({
expression: this.data.expression === '0' ? val : this.data.expression + String(val)
})
}
}
}
},
result() {
app.calculator.strList.length = 0;
app.calculator.strListP.length = 0;
app.calculator.list.length = 0;
app.calculator.calculate.length = 0;
this.expressToStrList(this.data.expression);
let tempList = app.calculator.strList;
this.expressToStrListP(tempList);
let tempP = app.calculator.strListP
for (let m in tempP) {
if (this.checkOperator(tempP[m])) {
let op1 = app.calculator.calculate[0];
app.calculator.calculate.shift();
let op2 = app.calculator.calculate[0];
app.calculator.calculate.shift();
app.calculator.calculate.unshift(this.countDetail(op2, tempP[m], op1));
} else {
app.calculator.calculate.unshift(tempP[m])
}
}
this.setData({
result: app.calculator.calculate[0]
});
},
countDetail(num1, operator, num2) {
let result = 0.0;
try {
if (operator == "×") {
result = parseFloat(num1) * parseFloat(num2);
} else if (operator == "/") {
result = parseFloat(num1) / parseFloat(num2);
} else if (operator == "%") {
result = parseFloat(num1) % parseFloat(num2);
} else if (operator == "+") {
result = parseFloat(num1) + parseFloat(num2);
} else {
result = parseFloat(num1) - parseFloat(num2);
}
} catch (error) {
}
return result;
},
expressToStrListP(tempList) {//将中缀表达式集合转变为后缀表达式集合
for (let item in tempList) {
if (this.checkOperator(tempList[item])) {
if (app.calculator.list.length == 0) {
app.calculator.list.unshift(tempList[item]);
} else {
if (this.compaerOperator(app.calculator.list[0], tempList[item])) {
for (let x in app.calculator.list) {
app.calculator.strListP.push(app.calculator.list[x]);
}
app.calculator.list.length = 0;
app.calculator.list.unshift(tempList[item]);
} else {
app.calculator.list.unshift(tempList[item]);
}
}
} else {
app.calculator.strListP.push(tempList[item]);
}
}
if (app.calculator.list.length > 0) {
for (let x in app.calculator.list) {
app.calculator.strListP.push(app.calculator.list[x]);
}
app.calculator.list.length = 0;
}
},
compaerOperator(op1, op2) {
if ((op1 == "%" || op1 == "×" || op1 == "/") && (op2 == "-" || op2 == "+")) {
return true;
} else {
return false;
}
},
expressToStrList(expression) { //将字符串表达式变成中缀队列
let temp = '';
for (let i = 0; i < expression.length; i++) {
if (i == 0 && expression[i] == "-") {
temp = temp + expression[i];
} else {
if (this.checkDigit(expression[i])) {
temp = temp + expression[i];
} else {
if (temp.length > 0) {
if (expression[i] == ".") {
temp = temp + expression[i];
} else {
app.calculator.strList.push(parseFloat(temp));
temp = '';
app.calculator.strList.push(expression[i]);
}
} else {
temp = temp + expression[i];
}
}
}
}
if (temp.length > 0 && this.checkDigit(temp.substring(temp.length - 1))) {
app.calculator.strList.push(parseFloat(temp));
temp = '';
}
},
//判断是否是运算符
checkOperator(input) {
if (input == "-" || input == "+" || input == "/" || input == "%" || input == "×") {
return true;
} else {
return false;
}
},
//判断是否是数字
checkDigit(input) {
if ((/^[0-9]*$/.test(input))) {
return true;
} else {
return false;
}
},
})
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