计算器
var num; var f; function show(n) { var show =document.getElementById("show"); if(show.value==0){ show.value=""; } show.value = show.value + n.value; } function t() { var show =document.getElementById("show"); show.value = show.value.substring(0,show.value.length-1); if(show.value=""){ show.value=0; } } function c() { var show =document.getElementById("show"); show.value=0; } function fh(x) { f=x.value; var show =document.getElementById("show"); num = show.value; show.value=""; } function rs() { var show =document.getElementById("show"); if(f=="+"){ show.value= parseInt(num) + parseInt(show.value) }else if(f=="-"){ show.value= parseInt(num) - parseInt(show.value) }else if(f=="*"){ show.value= parseInt(num) * parseInt(show.value) }else if(f=="/"){ show.value= parseInt(num) / parseInt(show.value) } }
