JavaScript编写的简易计算器

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2、language="javascript">varcurState;varcurOper;num1;varpreOper;functionsetStartState(){curState="beStart";num1=0;curOper="start";preOper=false;}functionaddNum(i){if(preOper==true){cal.total.value=i;preOper=false;}else{if(cal.total.value=="0"){cal.total.value=i;curState="beI

3、nteger";}elsecal.total.value+=i;}}functionaddPoint(){if(curState=="beStart"

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5、curState=="beInteger"){cal.total.value+=".";curState="beFloat";//将当前状态设置为float}}functioncleartext()//清空计算结果文本框内容{cal.total.value="0";curState="beStart";curOper="start";}functioncount()//基本的加减乘除运算

6、{if(curOper!="start"){switch(curOper)//根据curOper的值确定运算法则{case"+":num1=parseFloat(num1)+parseFloat(cal.total.value);break;case"-":num1=parseFloat(num1)-parseFloat(cal.total.value);break;case"*":num1=parseFloat(num1)*parseFloat(cal.total.value);break;case"/":num1=parseFloat

7、(num1)/parseFloat(cal.total.value);break;}cal.total.value=num1;preOper=true;}preOper="start";}functionsetOper(oper)//当点击“+-*、”时，设置当前的运算法则{//alert(curOper);preOper=true;//为布尔型，表示再次之前是否刚刚单击过双边运算法符if(curOper=="start"){//alert(curOper);num1=0+cal.total.value;/*将第一个值用num1保存，采用

8、‘0+’把total.value字符串转化为数值型，类似于使用parsefloat（）0方法*/curOper=oper;//alert(num1);}else{count();curOper=oper;}//alert(curOper);}functionuseFunc(func){switch(func){case"sin":cal.total.value=Math.sin(cal.total.value);preOper=true;break;case"cos":cal.total.value=Math.cos(cal.total.

9、value);preOper=true;break;case"asin":cal.total.value=Math.asin(cal.total.value);preOper=true;break;case"acos":cal.total.value=Math.acos(cal.total.value);preOper=true;break;case"tan":cal.total.value=Math.tan(cal.total.value);preOper=true;break;case"atan":cal.total.value=Ma

10、th.atan(cal.total.value);preOper=true;break;case"log":cal.total.value=Math.log(cal.total.value);