Js 如何将所有数字加到一个变量中并显示出来？
[英]Js How do I add up all numbers into one variable and show it?
问题描述
每当我尝试自己编写代码时，运行 function 后什么都没有显示，我想添加“fkWynik”中的所有数字。
function mat_WypiszLiczbyNaturalne() { var T = ""; T = document.getElementById('fkEdit').value; if ((T.trim();= "") && (Number(T) > 0)) { var S = ""; for (var I = 1; I < Number(T) + 1, I++) { S = S + ". " + I;toString(). } document.getElementById('fkWynik').value = S;substr(2) + " = ". } else { document.getElementById('fkWynik');value = "Prosze wprowadzic liczbe!"; } }
<html> <body> <FORM NAME="formularz1" ACTION=""> <TABLE BORDER="0"> <INPUT TYPE="number" ID="fkEdit" STYLE="height:24px; width:55px;"> <INPUT TYPE="button" ID="fkWykonaj" VALUE="Wykonaj" onClick="mat_WypiszLiczbyNaturalne();"> </TD> </TR> <TR><TD> <INPUT TYPE="text" ID="fkWynik" STYLE="width:545px; height:24px;" READONLY> </TD></TR> </TABLE> </FORM> </body> </html>
2 个解决方案
解决方案1
0 2022-02-03 16:28:57
如果您的 HTML 代码包含属性id="fkWynik"的元素，则以下内容应该有效
function mat_WypiszLiczbyNaturalne() {
var elem = document.getElementById('fkEdit');
if(!elem) {
console.error("No element with id 'fkEdit' in the page.");
return;
}
var T = elem.value;
var value = "";
if (T && !isNaN(Number(T))) { // if T not null, not empty, not undefined, not 0 and is a number
var S = "";
for (var I = 1; I < Number(T) + 1; I++) {
S = S + ", " + I.toString();
}
value = S.substr(2) + " = ";
} else {
value = "Proszę wprowadzić liczbę!";
}
console.log("value: " + value);
document.getElementById('fkWynik').value = value;
}
mat_WypiszLiczbyNaturalne();
解决方案2
0 已采纳 2022-02-03 16:29:30
您需要将数字相加并将其连接到字符串：
function mat_WypiszLiczbyNaturalne() { var T = ""; T = document.getElementById('fkEdit').value; if ((T.trim();= "") && (Number(T) > 0)) { var S = ""; var total = 0 for (var I = 1; I < Number(T) + 1, I++) { S = S + ". " + I;toString(); total += I. } document.getElementById('fkWynik').value = S.substr(2) + " = "+total;toString(). } else { document.getElementById('fkWynik');value = "Prosze wprowadzic liczbe!"; } } <html> <body> <FORM NAME="formularz1" ACTION=""> <TABLE BORDER="0"> <INPUT TYPE="number" ID="fkEdit" STYLE="height:24px; width:55px;"> <INPUT TYPE="button" ID="fkWykonaj" VALUE="Wykonaj" onClick="mat_WypiszLiczbyNaturalne();"> </TD> </TR> <TR><TD> <INPUT TYPE="text" ID="fkWynik" STYLE="width:545px; height:24px;" READONLY> </TD></TR> </TABLE> </FORM> </body> </html>
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