问题
My Code: "edited, added "var" in front of all variable, thanks. I tried removing the <form> but it wouldn't function when I did.
<head>
<title>Calculator</title>
<script language="javascript">
function calculate()
{
var v=parseInt(document.forms[0].txt1st.value);
var w=parseInt(document.forms[0].txt2nd.value);
var x=parseInt(document.forms[0].txt3rd.value);
var y=703;
var z = (v/w/x*y).toFixed(3);
document.getElementById("display").innerHTML=z;
}
</script>
</head>
<body>
<form name="cal" method="post" action="">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><input name="txt1st" type="text" id="txt1st"></td>
<td><input name="txt2nd" type="text" id="txt2nd"></td>
<td><input name="txt3rd" type="text" id="txt3rd"></td>
<td>x 703</td>
</tr>
</table>
<button onclick="calculate()">Calculate</button>
<div id="display"></div>
</body>
When I click the "Calculate" button the result displays in the div, but only for a split second then disappears. Keep in mind I'm very new to JavaScript. Any help appreciated, thanks.
回答1:
You are submitting the form and so the page is refreshing.
Add return false; to the end of your calculate function to prevent the form submission.
来源：https://stackoverflow.com/questions/12516783/javascript-calculator-result-flashes