将字符串更改为数字（简单...也许） [英] Changing strings to numbers(easy...maybe)
问题描述
我试图将3个数字加在一起，而不是得到1 + 2 + 3 = 6，我是
得到123我怎么能解决这个问题。
提前许多谢谢
Michael
< html> ;
< head>
< title>求和模板文件< / title>
< meta http-equiv ="内容型" content =" text / html;
charset = iso-8859-1">
< script language =" JavaScript">
function addUp（）{
var a，b，c，sum;
a = document.fred.aaa.value; //提取输入框中输入的文本字符串
b = document.fred.bbb.value;
c = document.fred。 ccc.value;
//问题出在下一行，所有其他行都没问题，
不应该改变
sum = a + b + c;
window.alert（总和是+总和）;
}
< ; / script>
< / head>
< body bgcolor =" #FFFFFF" text ="＃000000">
< form name =" fred">
< input type =" text"名称= QUOT; AAA" size =" 5">
< input type =" text"名称= QUOT; BBB" size =" 5">
< input type =" text"名称= QUOT; CCC" size =" 5">
< input type =" button" value =" Sum Data" onClick =" addUp（）;">
< / form>
< / body>
< / html> ;
Hi,
Im trying to add 3 numbers together, instead of getting 1+2+3=6, I''m
getting 123, how could I remedy this.
ManyThanks in advance
Michael
<html>
<head>
<title>Summation Template File</title>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">
<script language="JavaScript">
function addUp() {
var a,b,c,sum;
a = document.fred.aaa.value; // extract the string of text typed into
the input box
b = document.fred.bbb.value;
c = document.fred.ccc.value;
// the problem is on the next line, all the other lines are OK and
shouldn''t be changed
sum =a+b+c ;
window.alert("The sum is "+sum);
}
</script>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<form name="fred">
<input type="text" name="aaa" size="5">
<input type="text" name="bbb" size="5">
<input type="text" name="ccc" size="5">
<input type="button" value="Sum Data" onClick="addUp();">
</form>
</body>
</html>
推荐答案
MickG写道：
MickG wrote:
我试图将3个数字加在一起，而不是得到1 + 2 + 3 = 6，我得到123，我怎么能解决这个问题。
Hi,
Im trying to add 3 numbers together, instead of getting 1+2+3=6, I''m
getting 123, how could I remedy this.
使用parseInt（number）得到一个数字
Kae
use parseInt(number) to get a number
Kae
MickG于2005年2月28日在comp.lang.javascript中写道 ：
MickG wrote on 28 feb 2005 in comp.lang.javascript:
我试图将3个数字加在一起，而不是得到1 + 2 + 3 = 6，我是
得到123，怎么可能我解决了这个问题。
Im trying to add 3 numbers together, instead of getting 1+2+3=6, I''m
getting 123, how could I remedy this.
var a =''1''//字符串！
var b =''2''//字符串！
var c =''3''//字符串！
r = a + b + c
alert（r）//返回字符串123
r = + a + + b + + c
alert（r）//返回numbe r 6
r = 1 * a + 1 * b + 1 * c
alert（r）//返回6号
-
Evertjan。
荷兰。
（用我的电子邮件地址替换所有带点的十字架）
var a=''1'' // string !
var b=''2'' // string !
var c=''3'' // string !
r = a + b + c
alert(r) // returns string 123
r = +a + +b + +c
alert(r) // returns number 6
r = 1*a + 1*b + 1*c
alert(r) // returns number 6
--
Evertjan.
The Netherlands.
(Replace all crosses with dots in my emailaddress)
>我正在尝试将3个数字加在一起，而不是得到1 + 2 + 3 = 6，我是
> I''m trying to add 3 numbers together, instead of getting 1+2+3=6, I''m
得到123，我怎么能解决这个问题。
a = document.fred.aaa.value; //提取键入的文本字符串
//输入框
b = document.fred.bbb.value;
c = document.fred.ccc.value;
//问题出在下一行，所有其他行都没问题，
//不应该改变
sum = a + b + c;
getting 123, how could I remedy this. a = document.fred.aaa.value; // extract the string of text typed into
// the input box
b = document.fred.bbb.value;
c = document.fred.ccc.value;
// the problem is on the next line, all the other lines are OK and
// shouldn''t be changed
sum =a+b+c ;
sum =（+ a）+（+ b）+（+ c）;
见 http://www.crockford.com/javascript/survey.html
如果你遗漏了parens，它可能看起来像
sum = + a ++ b ++ c;
这将是非常的坏。最好清楚。
sum = (+a) + (+b) + (+c);
See http://www.crockford.com/javascript/survey.html
If you leave out the parens, it could look like
sum = +a++b++c;
which would be very bad. It is better to be clear.
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