js做的一个简单的计算器

calculatorvar Number1 = “; /输入第一个数var Number2 = “; /输入第二个数var NewNumber = “blank“;var opvalue = “;function Num(number)document.calculator.answer.value=number; /输出值function ClearCalc() /清屏Number1 = “;Number2 = “;NewNumber = “blank“;Num(“);function CheckNumber(answer) /读取输入值if(answer = “.“) Number = document.calculator.answer.value;if(Number.indexOf(“.“) != -1) answer = “;if(NewNumber = “yes“) Number2 += answer;Num(Number2);else if(NewNumber = “blank“) Number1 = answer;Number2 = “;NewNumber = “no“; else Number1 += answer;Num(Number1);function AddButton(x) /加if(x = 1) EqualButton();if(Number2 != “) Number1 = parseFloat(Number1) + parseFloat(Number2);NewNumber = “yes“;opvalue = +;Num(Number1);function SubButton(x) /减if(x = 1) EqualButton();if(Number2 != “) Number1 = parseFloat(Number1) - parseFloat(Number2);NewNumber = “yes“;opvalue = -;Num(Number1);function MultButton(x) /乘if(x = 1) EqualButton();if(Number2 != “) Number1 = parseFloat(Number1) * parseFloat(Number2);NewNumber = “yes“;opvalue = *;Num(Number1);function DivButton(x) /除if(x = 1) EqualButton();if(Number2 != “) Number1 = parseFloat(Number1) / parseFloat(Number2);NewNumber = “yes“;opvalue = /;Num(Number1);function SqrtButton() /开方Number1 = Math.sqrt(Number1);NewNumber = “blank“;Num(Number1);function RecipButton() /倒数Number1 = 1/Number1;NewNumber = “blank“;Num(Number1);function NegateButton() /正负数切换Number1 = parseFloat(-Number1);NewNumber = “no“;Num(Number1);function EqualButton() /等号if(opvalue = +) AddButton(0);if(opvalue = -) SubButton(0);if(opvalue = *) MultButton(0);if(opvalue = /) DivButton(0);Number2 = “;opvalue = “;function keyDown()var iCode=window.event.keyCode;if(event.shiftKey)switch(iCode)case 56:document.all.multiply.click();break;case 59:document.all.minus.click();break;case 60:document.all.plus.click();break;if(!event.shiftKeybreak;case 96:document.all.zero.click();break;case 97:document.all.one.click();break;case 98:document.all.two.click();break;case 99:document.all.three.click();break;case 100:document.all.four.click();break;case 101:document.all.five.click();break;case 102:document.all.six.click();break;case 103:document.all.seven.click();break;case 104:document.all.eight.click();break;case 105:document.all.nine.click();break;case 110:document.all.dot.click();break;case 13:document.all.equal.click();break;case 107:document.all.plus.click();break;case 109:document.all.minus.click();break;case 106:document.all.multiply.click();break;case 111:document.all.divide.click();break;case 48:document.all.zero.click();break;case 49:document.all.one.click();break;case 50:document.all.two.click();break;case 51:document.all.three.click();break;case 52:document.all.four.click();break;case 53:document.all.five.click();break;case 54:document.all.six.click();break;case 55:document.all.seven.click();break;case 56:document.all.eight.click();break;case 57:document.all.nine.click();break;case 190:document.a