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FIX: Change the original = number to <input type= "button" onclick= "Rescalc ()" value = "="/>, otherwise no event to activate JS calculation method:
Original URL: http://www.w3school.com.cn/tiy/t.asp?f=html5_form_output
<! DOCTYPE html>
<script type= "Text/javascript" >
function Rescalc ()
{
Numa=document.getelementbyid ("Num_a"). Value;
Numb=document.getelementbyid ("Num_b"). Value;
document.getElementById ("Result"). Value=number (NumA) +number (NumB);
}
</script>
<body>
<p> Simple Calculator:</p> using the output element
<form onsubmit= "return false" >
<input id= "Num_a"/> +
<input id= "Num_b"/> <input type= "button" onclick= "Rescalc ()" value = "="/>
<output id= "Result" onforminput= "Rescalc ()" ></output>
</form>
</body>
About W3school HTML5 part of the output element instance code (point to try it in person) to correct the problem
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