分享程序员开发的那些事...
更新时间：2023-10-06 19:17:52
simply use parse the variable value to integer using parseInt() method or add "+"before to your variable name. Because variables var1 and var2 returning string. To calculate those variable values, you need to convert it as a integer.
using parseInt() method
number=parseInt(var1)+parseInt(var2)
use + before variable name to convert into integer,
number= +var1 + +var2
try this code,
<html>
<body>
<script>
function myFunction(var1,var2){
number = parseInt(var1) + parseInt(var2)
//another way number= +var1+ +var2
document.write(number)
}
</script>
<form>
Number 1 : <input type="text" name="no1"><br>
Number 2 : <input type="text" name="no2"><br>
<input type="button" onclick="myFunction(this.form.no1.value,this.form.no2.value)" value="submit">
</form>
<p id="demo"></p>
</body>
</html>
using parseInt() DEMO
using + before variable name DEMO