ASP中用select case代替其他語言中的switch case, default用case else
asp中不能用switch語句,要用select case語句了
簡(jiǎn)單的介紹一下
選擇報(bào)表的工作一樣,如果語句。然而不同的是,他們可以檢查多個(gè)值。當(dāng)然,你有
多個(gè)相同的,如果.. else語句,但是這并不總是最好的方法。
選擇語句允許一個(gè)程序來計(jì)算表達(dá)式,并試圖匹配表達(dá)式的值案件標(biāo)簽。如果找到匹
配,程序執(zhí)行相關(guān)的聲明。對(duì)于SELECT語句的語法如下:
select case expression case label_1 statements_1 case label_2 statements_2 ... case else statements_n end select
該計(jì)劃首先查找與匹配的表達(dá)式的值標(biāo)簽的情況,然后條控制轉(zhuǎn)移到該條款,執(zhí)行相
關(guān)的聲明。如果沒有找到匹配的標(biāo)簽,程序查找任擇案Else子句,如果發(fā)現(xiàn),將控制
轉(zhuǎn)移到該條款,執(zhí)行相關(guān)的聲明。如果沒有Case Else子句發(fā)現(xiàn),程序繼續(xù)執(zhí)行的聲明
后選擇結(jié)束。利用休息時(shí)間,避免因進(jìn)入下一個(gè)代碼自動(dòng)執(zhí)行。
讓我們考慮一個(gè)例子:
<%@ language="vbscript"> <% Dim Flower Flower = "rose" select case flower case "rose" response.write(flower & " costs $2.50") case "daisy" response.write(flower & " costs $1.25") case "orchild" response.write(flower & " costs $1.50") case else response.write("There is no such flower in our shop") end select %>
例子1、
<% "/*ASP中用select case代替其他語言中的switch case, default用case else*/ dim today today = 5 select case today case 0 str = "星期天" case 1 str = "星期一" case 2 str = "星期二" case 3 str = "星期三" case 4 str = "星期四" case 5 str = "星期五" case 6 str = "星期六" case 7, 8, 9 str = "today的值是7,8,或9" case else str = "未知" end select response.write str response.End() %> /*------------輸出結(jié)果-------- 星期五 ------------*/
實(shí)例2、
board=request("board") select case board case "1" boardName = "技術(shù)版" case "2" boardName = "信息版" case "3" boardName = "客服星空" case "4" boardName = "灌水區(qū)" case "5" boardName = "市場(chǎng)營銷" case "6" boardName = "經(jīng)理論壇" case "7" boardName = "影音論壇" case "8" boardName = "延伸服務(wù)" case "9" boardName = "東北片區(qū)" case "10" boardName = "市場(chǎng)動(dòng)態(tài)" case "11" boardName = "群發(fā)交流" case "12" boardName = "hombre" case "14" boardName = "論壇" case "15" boardName = "在線答疑" case else boardName = "" end select
注意:case "1"后面不能有冒號(hào),boardName = "技術(shù)版"后面不能有分號(hào),而且不能出現(xiàn)break語句
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