``` 與ASP相比,JSP(JavaServer Pages)是一種更加通用的服務(wù)器端腳本語言。它是基于Java語言開發(fā)的,可以運行在幾乎所有的操作系統(tǒng)上。與ASP類似,JSP也可以在HTML中嵌入Java代碼。下面是一個簡單的JSP代碼示例,用于展示數(shù)據(jù)庫中的數(shù)據(jù): ```<%
Dim conn
Dim rs
Set conn = Server.CreateObject("ADODB.Connection")
conn.Open "your_connection_string"
Set rs = Server.CreateObject("ADODB.Recordset")
rs.Open "SELECT * FROM your_table", conn
Do Until rs.EOF
Response.Write rs("your_column_name")
rs.MoveNext
Loop
rs.Close
conn.Close
Set rs = Nothing
Set conn = Nothing
%>
``` PHP作為一種開源的服務(wù)器端腳本語言,被廣泛應(yīng)用于互聯(lián)網(wǎng)開發(fā)中。與ASP和JSP相比,PHP具有更加靈活和易于學(xué)習(xí)的特點。下面是一個簡單的PHP代碼示例,用于展示數(shù)據(jù)庫中的數(shù)據(jù): ```<%@page import="java.sql.*" %>
<%
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("your_database_driver");
conn = DriverManager.getConnection("your_connection_string");
stmt = conn.createStatement();
rs = stmt.executeQuery("SELECT * FROM your_table");
while (rs.next()) {
out.println(rs.getString("your_column_name"));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (rs != null) rs.close();
if (stmt != null) stmt.close();
if (conn != null) conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
%>
``` JavaScript是一種廣泛應(yīng)用于網(wǎng)頁開發(fā)中的腳本語言,可以運行在客戶端的瀏覽器中。與服務(wù)器端腳本語言相比,JavaScript主要用于實現(xiàn)網(wǎng)頁的動態(tài)效果和交互。下面是一個簡單的JavaScript代碼示例,用于在網(wǎng)頁上展示當(dāng)前時間: ```<?php
$conn = mysqli_connect("your_host", "your_username", "your_password", "your_database");
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT * FROM your_table";
$result = $conn->query($sql);
if ($result->num_rows >0) {
while ($row = $result->fetch_assoc()) {
echo $row["your_column_name"];
}
} else {
echo "0 results";
}
$conn->close();
?>
``` 綜上所述,ASP、JSP、PHP和JavaScript作為四種常用的網(wǎng)頁開發(fā)語言,在不同的應(yīng)用場景中有著不同的優(yōu)勢。ASP在Windows平臺的網(wǎng)頁開發(fā)中表現(xiàn)出色,JSP具有良好的跨平臺性,PHP具有簡單易學(xué)的特點,而JavaScript則主要用于實現(xiàn)網(wǎng)頁的動態(tài)效果和交互。熟練掌握這些語言,將能夠更好地進行網(wǎng)頁開發(fā),并為用戶提供更好的用戶體驗。<script>
var date = new Date();
var currentTime = date.getHours() + ":" + date.getMinutes() + ":" + date.getSeconds();
document.getElementById("current_time").innerHTML = currentTime;
</script>