btn.onclick=function(){ if(txt1.value!=" "&&txt2.value!=" "){//此中不加空格,为判断是否为字符串,加空格,才为内容判断 if(!isNaN(txt1.value)&&!isNaN(txt2.value)){ show.innerHTML=num(txt1.value,txt2.value); }else{ show.innerHTML=‘您输入的不是数字!‘; } }else{ show.innerHTML=‘请输入内容!!!‘; }}
时间: 2024-08-03 03:34:48