非常简单的运算器
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>运算器</title><style type="text/css">* {margin:0;padding:0;}body {font-family:"宋体";font-size:12px;color:#333;}.fm1, .fm2 {width:300px;margin:30px auto;background:#CCC;padding:30px 0 30px 0;}.fm1 input, .fm2 input {width:120px;margin:0 auto;display:block;}</style></head><body><form value="两个数字的运算器1" onclick="comp();" /></form><script type="text/javascript">//函数function comp(){ while(true){//接收输入var num1=prompt("请输入第一个数字：","");var num2=prompt("请输入第二个数字：","");var cp=prompt("请输入符号：","");//判断输入的符号，进行运算if(cp=="*"){ document.write("计算结果："+num1+"*"+num2+"="+(parseInt(num1)*parseInt(num2))); break;}else if(cp=="/"){ document.write("计算结果："+num1+"/"+num2+"="+(parseInt(num1)/parseInt(num2))); break;}else if(cp=="+"){ document.write("计算结果："+num1+"+"+num2+"="+(parseInt(num1)+parseInt(num2))); break;}else if(cp=="-"){ document.write("计算结果："+num1+"-"+num2+"="+(parseInt(num1)-parseInt(num2))); break;}else{ document.write("输入有误，无法计算，请重新输入！"); var flag=confirm("是否要重新输入！"); if(flag==false){ document.write("已退出程序·"); break; }} }}</script></body></html>
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效果图：
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