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我似乎可以找到哪一部分，我有错误的理解，因为它不会显示我想要result.Please帮助！|
<head>
<script type="text/java script">
function fgr()
{
var a=parseFloat(document.form1.i3.value);
var b=parseFloat(document.form1.i4.value);
var c=parseFloat(document.form1.i5.value);
var d=parseFloat(document.form1.i6.value);
var e=parseFloat(document.form1.i7.value);
var f=(.2*a+.2*b+.2*c+.4*d4);
document.write i7.value=f
}
</script>
<tr>
<td align="center" colspan="1" style="color:blue;background-color:ffffff;font-size
.9em;font-weight:bold;">Student Form</td>
<form name="Student Form" id="form1" style="margin-left:10%; width:40%; margin-right:50%"; text-align:left">
</head>
<body>
Name:
<input name="i1" id="i1" type="text" size="35" />
<br /><br />
Year Level:
<input name="i2" id="i2" type="text" size="35" />
<br /><br />
Prelim:
<input name="i3" id="i3" type="text" size="35" />
<br /><br />
Midterm:
<input name="i4" id="i4" type="text" size="35" />
<br /><br />
Prefinal:
<input name="i5" id="i5" type="text" size="35" />
<br /><br />
Finals :
<input name="i6" id="i6" type="text" size="35" />
<br /><br />
<br>Calculate<br />
<input name="b1" id="b1" type="button" value="Calculate Grade" onclick="fgr()" />
<br /><br />
Final Grade:
<input name="i7" id="i7" type="text" size="35" />
</form>
</body>
</html></br></tr>