本文實(shí)例為大家分享了JS實(shí)現(xiàn)簡易計(jì)算器的具體代碼，供大家參考，具體內(nèi)容如下

簡易計(jì)算器：

1）選擇需要運(yùn)算的類型，輸入對應(yīng)的數(shù)字2）輸入需要參與運(yùn)算的數(shù)字3）輸入“計(jì)算”二字，進(jìn)行運(yùn)算后，顯示運(yùn)算結(jié)果及運(yùn)算表達(dá)式

<script type='text/javascript'> // 加法運(yùn)算 function plus(arrPlus){ var sum = 0; for(var i = 0 ; i < arrPlus.length ; i++){ sum = sum + arrPlus[i]; } console.log(’函數(shù)plus循環(huán)后求和結(jié)果的數(shù)是’+ sum); return sum; } // 減法運(yùn)算 function subtract(arrSubtract){ var substractResult = arrSubtract[0]; for(var i = 1 ; i < arrSubtract.length ; i++){ substractResult = substractResult - arrSubtract[i] ; } return substractResult; } // 乘法運(yùn)算 function multiple(arrMultiple){ var multipleResult = 1; for(var i = 0 ; i < arrMultiple.length ; i++){ multipleResult = multipleResult * arrMultiple[i]; } return multipleResult; } // 除法運(yùn)算 function divide(arrDivide){ var divideResult = arrDivide[0]; for(var i = 1 ; i < arrDivide.length ; i++){ divideResult = divideResult / arrDivide[i]; } return divideResult; } // 輸入需要運(yùn)算的數(shù)值 function calculateNum(num,mention){ i = 0; num = []; do{ // var i = 0; mention = prompt(’請輸入第’+ (i+1) +’個(gè)數(shù)，注意：’+’輸入'計(jì)算'二字將獲得結(jié)果’); if(mention != ’計(jì)算’){ mention = mention * 1; num[i]= mention ; i++; } }while(mention != ’計(jì)算’); console.log(’calculateNum存入的數(shù)值是’ + num); return num; } //顯示計(jì)算表達(dá)式 function formula( arr){ fom = [] ; for(var i =0 ; i < arr.length ; i++){ if(apply == 1){ fom = fom + arr[i] + ’+’; }else if (apply == 2){ fom = fom + arr[i] + ’-’; }else if (apply == 3){ fom = fom + arr[i] + ’*’; }else if(apply == 4){ fom = fom + arr[i] + ’/’; } } console.log(’計(jì)算表達(dá)式formula函數(shù)輸出的是’ + fom); return fom; } //全局變量 var i = 0 ; var fom = ’’; var num = []; var mention = ’’ apply = ’’; do{ // 計(jì)算器主面板 apply = prompt(’歡迎使用簡易計(jì)算器n’+’1、加法運(yùn)算n’+’2、減法運(yùn)算n’+’3、乘法運(yùn)算n’+’4、除法運(yùn)算n’+’5、退出n’+’請輸入您的選項(xiàng)’); apply = apply * 1; switch(apply){ case 1: var plusInput = calculateNum(num,mention); alert(formula(plusInput)+’計(jì)算結(jié)果是’ + plus(plusInput)); break; case 2: var subtractInput = calculateNum(num,mention); alert(formula(subtractInput)+’計(jì)算結(jié)果是’ + subtract(subtractInput)); break; case 3: var multipleInput = calculateNum(num,mention); alert(formula(multipleInput)+’計(jì)算結(jié)果是’ + multiple(multipleInput)); break; case 4: var divideInput = calculateNum(num,mention); alert(formula(divideInput)+’計(jì)算結(jié)果是’ + divide(divideInput)); break; } }while(apply != 5) alert(’歡迎使用！’);</script>

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