我是JavaScript的初学者。在这里,我无法弄清楚为什么我的代码不会读取我输入的值,即使我无法找到代码中的任何错误。有任何有用的建议来编辑我的代码来修复错误吗?
function gpacalc() {
//define valid grades and their values
var gr = new Array(6);
var cr = new Array(6);
var ingr = new Array(5);
var incr = new Array(5);
// define valid grades and their values
var grcount = 11;
gr[0] = "A+";
cr[0] = 4;
gr[1] = "A";
cr[1] = 4;
gr[2] = "A-";
cr[2] = 3.70;
gr[3] = "B+";
cr[3] = 3.30;
gr[4] = "B";
cr[4] = 3;
gr[5] = "B-";
cr[5] = 2.70;
gr[6] = "C+";
cr[6] = 2.30;
gr[7] = "C";
cr[7] = 2;
gr[8] = "C-";
cr[8] = 1.70;
gr[9] = "D";
cr[9] = 1;
gr[10] = "D-";
cr[10] = 0.70;
// retrieve user input
ingr[0] = document.GPACalcForm.GR1.value;
ingr[1] = document.GPACalcForm.GR2.value;
ingr[2] = document.GPACalcForm.GR3.value;
ingr[3] = document.GPACalcForm.GR4.value;
ingr[4] = document.GPACalcForm.GR5.value;
incr[0] = document.GPACalcForm.CR1.value;
incr[1] = document.GPACalcForm.CR2.value;
incr[2] = document.GPACalcForm.CR3.value;
incr[3] = document.GPACalcForm.CR4.value;
incr[4] = document.GPACalcForm.CR5.value;
// Calculate GPA
var allgr = 0;
var allcr = 0;
var gpa = 0;
for (var x = 0; x < 5; x++) {
if (ingr[x] == "")
break;
alert("Error: You did not enter a numeric credits value for subject. If the subject is worth 0 credits, then enter the number 0 in the field.");
var validgrcheck = 0;
for (var xx = 0; xx < grcount; xx++) {
if (ingr[x] == gr[xx]) {
allgr = allgr + (parseInt(incr[x], 10) * cr[xx]);
allcr = allcr + parseInt(incr[x], 10);
validgrcheck = 1;
break;
}
}
if (validgrcheck == 0) {
alert("Error: Could not recognize the grade entered for subject " + eval(x + 1) + ". Please use standard college grades in the form of A+, A, B+ ... D-");
return 0;
}
}
if (allcr == 0) {
alert("Error:You did not enter any credit values. GPA = N/A");
return 0;
}
gpa = allgr / allcr;
alert("GPA = " + gpa);
return 0;
}
&#13;
<center>
<form name="GPACalcForm">
<table border="2" bgcolor="#bb8fce" cellpadding="5" cellspacing="2">
<TH> </TH>
<TH>Grade</TH>
<TH>Credits</TH>
<TR>
<TD>IT 201</TD>
<TD><input type="text" size="5" name="GR1" align="top" maxlength="5"></TD>
<TD><input type="text" size="5" name="CR1" align="top" maxlength="5"></TD>
</TR>
<TR>
<TD>IT 202</TD>
<TD><input type="text" size="5" name="GR2" align="top" maxlength="5"></TD>
<TD><input type="text" size="5" name="CR2" align="top" maxlength="5"></TD>
</TR>
<TR>
<TD>IT 203</TD>
<TD><input type="text" size="5" name="GR3" align="top" maxlength="5"></TD>
<TD><input type="text" size="5" name="CR3" align="top" maxlength="5"></TD>
</TR>
<TR>
<TD>IT 204</TD>
<TD><input type="text" size="5" name="GR4" align="top" maxlength="5"></TD>
<TD><input type="text" size="5" name="CR4" align="top" maxlength="5"></TD>
</TR>
<TR>
<TD>IT 205</TD>
<TD><input type="text" size="5" name="GR5" align="top" maxlength="5"></TD>
<TD><input type="text" size="5" name="CR5" align="top" maxlength="5"></TD>
</TR>
<TR>
<TR align="center">
<TD colspan="3">
<input type="button" value="Calculate" name="CalcButton" OnClick="gpacalc()">
</TD>
</TR>
</table>
</form>
<br/>
<p> </p>
</center>
<br/>
&#13;
我是JavaScript的初学者。在这里,我无法弄清楚为什么我的代码不会读取我输入的值,即使我可以找出代码中的任何错误。有任何有用的建议来编辑我的代码来修复错误吗?
答案 0 :(得分:0)
function gpacalc()
{
//define valid grades and their values
var gr = new Array(6);
var cr = new Array(6);
var ingr = new Array(5);
var incr = new Array(5);
// define valid grades and their values
var grcount = 11;
gr[0] = "A+";
cr[0] = 4;
gr[1] = "A";
cr[1] = 4;
gr[2] = "A-";
cr[2] = 3.70;
gr[3] = "B+";
cr[3] = 3.30;
gr[4] = "B";
cr[4] = 3;
gr[5] = "B-";
cr[5] = 2.70;
gr[6] = "C+";
cr[6] = 2.30;
gr[7] = "C";
cr[7] = 2;
gr[8] = "C-";
cr[8] = 1.70;
gr[9] = "D";
cr[9] = 1;
gr[10] = "D-";
cr[10] = 0.70;
// retrieve user input
ingr[0] = document.GPACalcForm.GR1.value;
console.log(ingr[0]);
ingr[1] = document.GPACalcForm.GR2.value;
ingr[2] = document.GPACalcForm.GR3.value;
ingr[3] = document.GPACalcForm.GR4.value;
ingr[4] = document.GPACalcForm.GR5.value;
incr[0] = document.GPACalcForm.CR1.value;
incr[1] = document.GPACalcForm.CR2.value;
incr[2] = document.GPACalcForm.CR3.value;
incr[3] = document.GPACalcForm.CR4.value;
incr[4] = document.GPACalcForm.CR5.value;
// Calculate GPA
var allgr = 0;
var allcr = 0;
var gpa = 0;
for (var x = 0; x < 5; x++)
{
if (ingr[x] == "") {
alert("Error: You did not enter a numeric credits value for subject. If the subject is worth 0 credits, then enter the number 0 in the field.");
break;
}
var validgrcheck = 0;
for (var xx = 0; xx < grcount; xx++)
{
if (ingr[x] == gr[xx])
{
allgr = allgr + (parseInt(incr[x],10) * cr[xx]);
allcr = allcr + parseInt(incr[x],10);
validgrcheck = 1;
break;
}
}
console.log(validgrcheck);
if (validgrcheck == 0)
{
alert("Error: Could not recognize the grade entered for subject " + eval(x + 1) + ". Please use standard college grades in the form of A+, A, B+ ... D-");
return 0;
}
}
if (allcr == 0)
{
alert("Error:You did not enter any credit values. GPA = N/A");
return 0;
}
gpa = allgr / allcr;
alert("GPA = " + gpa);
return 0;
}
<center>
<form name = "GPACalcForm">
<table border = "2" bgcolor = #bb8fce cellpadding = "5" cellspacing = "2">
<TH> </TH>
<TH>Grade</TH>
<TH>Credits</TH>
<TR>
<TD>IT 201</TD>
<TD><input type = "text" size = "5" name = "GR1" align = "top" maxlength = "5"></TD>
<TD><input type = "text" size = "5" name = "CR1" align = "top" maxlength = "5"></TD>
</TR>
<TR>
<TD>IT 202</TD>
<TD><input type = "text" size = "5" name = "GR2" align = "top" maxlength = "5"></TD>
<TD><input type = "text" size = "5" name = "CR2" align = "top" maxlength = "5"></TD>
</TR>
<TR>
<TD>IT 203</TD>
<TD><input type = "text" size = "5" name = "GR3" align = "top" maxlength = "5"></TD>
<TD><input type = "text" size = "5" name = "CR3" align = "top" maxlength = "5"></TD>
</TR>
<TR>
<TD>IT 204</TD>
<TD><input type = "text" size = "5" name = "GR4" align = "top" maxlength = "5"></TD>
<TD><input type = "text" size = "5" name = "CR4" align = "top" maxlength = "5"></TD>
</TR>
<TR>
<TD>IT 205</TD>
<TD><input type = "text" size = "5" name = "GR5" align = "top" maxlength = "5"></TD>
<TD><input type = "text" size = "5" name = "CR5" align = "top" maxlength = "5"></TD>
</TR>
<TR>
<TR align = "center">
<TD colspan = "3">
<input type = "button" value = "Calculate" name = "CalcButton" OnClick = "gpacalc()">
</TD>
</TR>
</table>
</form>
<br/>
<p> </p>
</center>
<br/>
我在您的代码中进行了以下更改: -
if (ingr[x] == "")
break;
alert("Error: You did not enter a numeric credits value for subject. If the subject is worth 0 credits, then enter the number 0 in the field.");
到
if (ingr[x] == "") {
alert("Error: You did not enter a numeric credits value for subject. If the subject is worth 0 credits, then enter the number 0 in the field.");
break;
}