簡(jiǎn)單一招用ASP實(shí)現(xiàn)對(duì)IE地址欄參數(shù)的判斷
簡(jiǎn)單一招用ASP實(shí)現(xiàn)對(duì)IE地址欄參數(shù)的判斷
用ASP實(shí)現(xiàn)IE地址欄參數(shù)的判斷
在服務(wù)器端asp程序可以接受html頁(yè)面上的form傳來(lái)的參數(shù),那么它又如何實(shí)現(xiàn)IE地址參數(shù)判斷呢?
當(dāng)?shù)刂窓跊](méi)有參數(shù)"id"時(shí):
Request.QueryString["ID"] == null Convert.ToString(Request.QueryString["ID"]) == null
注意這樣會(huì)出錯(cuò):
Request.QueryString["ID"].ToString();當(dāng)?shù)刂窓谟袇?shù)"id",但沒(méi)有賦值的時(shí)候:
Request.QueryString["ID"] == "" Request.QueryString["ID"] == String.Empty Convert.ToString(Request.QueryString["ID"]) == "" Convert.ToString(Request.QueryString["ID"]) == String.Empty 同時(shí)判斷二個(gè)條件的時(shí)候:
if ("" + Request.QueryString["ID"] == "") {...} if (("" + Request.QueryString["ID"]).Length == 0) {...}