我试过使用 Plus算术运算 来计算2个输入文本类型数值，但是我的结果是这些值是在一起的，如下所示： p>
- 值1：5
- 值2：5
结果
55通缉结果
10代码
< script type =text / javascript> 函数cal（）{ var plus = document.getElementById（'plus'）。value， plus1 = document.getElementById（'plus1'）。value; var x = plus + plus1; var result = document.getElementById（'result'）; if（result.value ==）{ result.innerHTML =？; } else { result.innerHTML = x; } } < / script> < input type =textid =plus/> +< input type =textid =plus1/> =< span id =result>< / span>我怎样才能得到结果而不是几个数字呢？
<您需要将它们解析为Integer类型： var x = parseInt（plus）+ parseInt（plus1）;然后您可以使用 isNaN（） 来确定它是否是有效的操作：（注意，我正在检查值 x 不是结果输出）
if（isNaN（x ））{ result.innerHTML =？; } else { result.innerHTML = x; }生活演示： jsfiddle/4KB5Y/3/
I've tried use Plus Arithmetic Operation to calculate 2 input text type number values, but my result was the values are "together", like that:
- Value one: 5
- Value two: 5
Result
55Wanted Result
10Code
<script type="text/javascript"> function cal(){ var plus = document.getElementById('plus').value, plus1 = document.getElementById('plus1').value; var x = plus + plus1; var result = document.getElementById('result'); if(result.value == ""){ result.innerHTML = "?"; } else{ result.innerHTML = x; } } </script> <input type="text" id="plus" /> + <input type="text" id="plus1" /> = <span id="result"></span>How can I get plus result instead couple of numbers together?
解决方案You need to parse them to an Integer type:
var x = parseInt(plus) + parseInt(plus1);Then you can use isNaN() to determine whether it was a valid operation or not: (note that I'm checking the value of x not of the resulting output)
if(isNaN(x)){ result.innerHTML = "?"; } else{ result.innerHTML = x; }Living demo: jsfiddle/4KB5Y/3/