JavaScript如何将数组插入到表中
JavaScript how to insert array into a table
我想知道如何将这个数组插入到表中。这是我的代码;我希望它像这样显示:
学生姓名学生成绩
如果有人知道怎么做，我将不胜感激。
var gradeAwarded;
var max;
var A =0;
var B =0;
var C=0;
var F=0;
var Sum = 0
var average
var repeat, studentArr = [], markArr = [];
while (repeat !== 'n'){
studentArr.push(prompt("Enter Student Name: ", "Ross"));
markArr.push(parseInt (prompt("Enter Student mark: ", 50)));
if (markArr <0 || markArr >100){
alert("Grate out of bounds");
}else if (markArr >= 83){
gradeAwarded = "A";
A = A + 1;
}else if (markArr >= 70){
gradeAwarded = "B";
B = B+1;
}else if (markArr >= 50){
gradeAwarded = "C";
C = C+1;
}else if (markArr >= 0){
gradeAwarded = "F";
F = F+1;
}
repeat = prompt ("Do you want to enter another student: y/n");
}
Array.prototype.max = function() {
return Math.max.apply(Math, markArr);
};
Array.prototype.min = function() {
return Math.min.apply(Math, markArr);
};
for(var x = 0; x < markArr.length; x ++)
{
Sum = Sum + markArr[x];
}
average = Sum / markArr.length;
var min = markArr.min();
var max = markArr.max();
for(var i = 0; i < markArr.length; i++)
document.write(<tr> markArr[i] </tr>);
document.write("The Highest mark was : "+max+"<br>");
document.write("The Lowest mark was : "+min +"<br>");
document.write("The Average mark was : "+average+"<br>");
document.write("number A grades : "+A+"<br>");
document.write("number B grades : "+B+"<br>");
document.write("number C grades : "+C+"<br>");
document.write("number F grades : "+F+"<br>");
希望对您有所帮助
var markAwarded;
var gradeAwarded;
var max;
var A = 0;
var B = 0;
var C = 0;
var F = 0;
var Sum = 0
var average
var repeat, studentArr = [], markArr = [], gradeArr = [];
while (repeat !== 'n') {
studentArr.push(prompt("Enter Student Name: ", "Ross"));
markAwarded = parseInt(prompt("Enter Student mark: ", 50));
markArr.push(markAwarded);
if (markAwarded < 0 || markAwarded > 100) {
alert("Grate out of bounds");
} else if (markAwarded >= 83) {
gradeAwarded = "A";
A = A + 1;
} else if (markAwarded >= 70) {
gradeAwarded = "B";
B = B + 1;
} else if (markAwarded >= 50) {
gradeAwarded = "C";
C = C + 1;
} else if (markAwarded >= 0) {
gradeAwarded = "F";
F = F + 1;
}
gradeArr.push(gradeAwarded);
repeat = prompt("Do you want to enter another student: y/n");
}
Array.prototype.max = function () {
return Math.max.apply(Math, markArr);
};
Array.prototype.min = function () {
return Math.min.apply(Math, markArr);
};
for (var x = 0; x < markArr.length; x++) {
Sum = Sum + markArr[x];
}
average = Sum / markArr.length;
var min = markArr.min();
var max = markArr.max();
document.write("<table style='border:1px solid black;'><tr><th>Student Name</th><th>Student Mark</th><th>Student Grade </th></tr>");
for (var i = 0; i < markArr.length; i++) {
document.write("<tr><td>" + studentArr[i] + "</td><td>" + markArr[i] + "</td><td>" + gradeArr[i] + "</td> </tr>");
}
document.write("</table>");
document.write("The Highest mark was : " + max + "<br>");
document.write("The Lowest mark was : " + min + "<br>");
document.write("The Average mark was : " + average + "<br>");
document.write("number A grades : " + A + "<br>");
document.write("number B grades : " + B + "<br>");
document.write("number C grades : " + C + "<br>");
document.write("number F grades : " + F + "<br>");
如果你想完全从javascript中创建表，有这样的函数:
var body = document.getElementsByTagName('body')[0];
var table = document.createElement('table');
var tr = document.createElement('tr');
var td = document.createElement('td');
td.nodeValue = someDataToDisplayInTheCell;
tr.appendChild(td);
table.appendChild(tr);
body.appendChild(body);
试着看看这个:打印出Javascript数组在表
从数组创建表有很多种方法
试试这个代码
<script>
var gradeAwarded;
var max;
var A =0;
var B =0;
var C=0;
var F=0;
var Sum = 0
var average
var repeat, studentArr = [], markArr = [];
while (repeat !== 'n'){
studentArr.push(prompt("Enter Student Name: ", "Ross"));
markArr.push(parseInt (prompt("Enter Student mark: ", 50)));
if (markArr <0 || markArr >100){
alert("Grate out of bounds");
}else if (markArr >= 83){
gradeAwarded = "A";
A = A + 1;
}else if (markArr >= 70){
gradeAwarded = "B";
B = B+1;
}else if (markArr >= 50){
gradeAwarded = "C";
C = C+1;
}else if (markArr >= 0){
gradeAwarded = "F";
F = F+1;
}
repeat = prompt ("Do you want to enter another student: y/n");
}
Array.prototype.max = function() {
return Math.max.apply(Math, markArr);
};
Array.prototype.min = function() {
return Math.min.apply(Math, markArr);
};
for(var x = 0; x < markArr.length; x ++)
{
Sum = Sum + markArr[x];
}
average = Sum / markArr.length;
var min = markArr.min();
var max = markArr.max();
document.write("<table>");
for(var i = 0; i < markArr.length; i++){
document.write("<tr>");
document.write("<td>"+ studentArr[i] + '</td>');
document.write("<td>"+ markArr[i] + '</td>');
if (markArr[i] >= 83){
gradeAwarded = "A";
}else if (markArr[i] >= 70){
gradeAwarded = "B";
}else if (markArr[i] >= 50){
gradeAwarded = "C";
}else if (markArr[i] >= 0){
gradeAwarded = "F";
}
document.write("<td>"+ gradeAwarded + '</td>');
}
document.write("</table>");
document.write("The Highest mark was : "+max+"<br>");
document.write("The Lowest mark was : "+min +"<br>");
document.write("The Average mark was : "+average+"<br>");
document.write("number A grades : "+A+"<br>");
document.write("number B grades : "+B+"<br>");
document.write("number C grades : "+C+"<br>");
document.write("number F grades : "+F+"<br>");
</script>
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