JavaScript編寫的簡易計(jì)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";//將當(dāng)前狀態(tài)設(shè)置為float}}functioncleartext()//清空計(jì)算結(jié)果文本框內(nèi)容{cal.total.value="0";curState="beStart";curOper="start";}functioncount()//基本的加減乘除運(yùn)算

6、{if(curOper!="start"){switch(curOper)//根據(jù)curOper的值確定運(yùn)算法則{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)//當(dāng)點(diǎn)擊“+-*、”時(shí)，設(shè)置當(dāng)前的運(yùn)算法則{//alert(curOper);preOper=true;//為布爾型，表示再次之前是否剛剛單擊過雙邊運(yùn)算法符if(curOper=="start"){//alert(curOper);num1=0+cal.total.value;/*將第一個(gè)值用num1保存，采用

8、‘0+’把total.value字符串轉(zhuǎn)化為數(shù)值型，類似于使用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);