字符串和OR

问题描述

嗨


选择任何一个国家/地区的'或''的正确语法是什么？

来自下拉列表列表？


这是我认为应该工作的，但似乎没有。


if（form.country.options [chooseSelect] .value ==" FR" ||" DE" ||" UK"）{

这样做

}其他{

这样做

}


感谢您的帮助。


Roy

解决方案

Hey Roy，


你到底有什么是一个单独的比较

form.country.options [chooseSelect] .value和两个OR条件将

总是评估为真。


尝试：


if（form.country.options [chooseSelect] .value ==" FR" ||

form.country.options [chooseSelect] .value ==" DE" ||

form.country.options [chooseSelect] .value ==" UK"）{


-

美国爱国者法案是美国历史上最不爱国的行为。

Feingold-Obama''08 - 因为宪法不是历史，

这是法律。

Hey Roy，

你有什么得到了一个比较

form.country.options [chooseSelect] .value和两个OR条件将

总是评估为真。


尝试：


if（form.country.options [chooseSelect] .value ==" FR" ||

form.country.options [chooseSelect] .value ==" DE" ||

form.country.options [chooseSelect] .value ==" UK"）{

谢谢，Ivan

Hey Roy,

What you''ve got there is a single comparison of
form.country.options[chooseSelect].value and two OR conditions that will
always evaluate to true.

Try:

if (form.country.options[chooseSelect].value == "FR" ||
form.country.options[chooseSelect].value == "DE" ||
form.country.options[chooseSelect].value == "UK") {

--
The USA Patriot Act is the most unpatriotic act in American history.
Feingold-Obama ''08 - Because the Constitution isn''t history,
It''s the law.

Hey Roy,

What you''ve got there is a single comparison of
form.country.options[chooseSelect].value and two OR conditions that will
always evaluate to true.

Try:

if (form.country.options[chooseSelect].value == "FR" ||
form.country.options[chooseSelect].value == "DE" ||
form.country.options[chooseSelect].value == "UK") {

Thanks, Ivan

That''s grossly inefficient, both in transmission and execution.

var Tmp = form.country.options[chooseSelect].value
if (Tmp == "FR" || Tmp == "DE" || Tmp == "UK") {
If the number of comparisons may vary, the OP can put the test strings
in an array and loop through it; that can conveniently be written as

function IsIn(Val, Arr) { var J
for (J in Arr) if (Val==Arr[J]) return true
return false }

if (IsIn(form.country.options[chooseSelect].value, ["FR", "DE", "UK"])) {

--
? John Stockton, Surrey, UK. [email protected] Turnpike v4.00 IE 4 ?
<URL:http://www.jibbering.com/faq/>? JL/RC: FAQ of news:comp.lang.javascript
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<URL:http://www.merlyn.demon.co.uk/TP/BP/Delphi/jscr/&c, FAQ items, links.

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