javascript传递参数给cgi

在客户端使用html网页时，有时需要传递参数给客户端，使用cgi就比较轻松的实现这个功能，例程如下，

用户在客户端打开网页login.html登录，输入用户名和密码，提交，调用服务端的login.cgi程序，同时将参数传递给login.cgi，

下面这种方面可以不打开新页面，而完成后台运行

<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312"/>
<title>C+CGI+AJAX测试</title>
<script>
function createXHR()
{
	var xhr;
	try
	{
		xhr = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch(e)
	{
		try
		{
			xhr = new ActiveObject("Microsoft.XMLHTTP");
		}
		catch(E)
		{
			xhr = false;
		}
	}

	if(!xhr && typeof XMLHttpRequest != 'undefined')
	{
		xhr = new XMLHttpRequest();
	}
	return xhr;
}

function sender(val)
{
	xhr = createXHR();
	if(xhr)
	{
		xhr.onreadystatechange = callbackFunction;
		xhr.open("GET","./cgi-bin/login.cgi?"+val);  //调用login.cgi程序，val为需要传递的参数
		xhr.send(null);
	}
	else
	{
		alert("浏览器不支持，请更换浏览器！");
	}
}

function callbackFunction()
{
	if(xhr.readyState == 4)
	{
		if(xhr.status == 200)
		{
			var returnValue = xhr.responseText;//returnValue为login.cgi返回的结果
			if(returnValue=="login success")
				window.location.replace('main.html');
			else
				document.getElementById("current_time").innerHTML = "用户名或密码错误";
		}
		else
		{
			alert("页面出现异常！");
		}
	}
}
function ok()
{
	val = "username="+document.message.username.value+"&password="+document.message.password.value; //val为需要传递的用户名和密码
	sender(val);
}
</script>
</head>
<body>
<center>
<p><div id="current_time">
</div>
<form name="message">
用户名: <input type="text" INPUT NAME="username" SIZE="30"  maxlength="20"><p>
<P>密码: <input type="password" INPUT NAME="password" SIZE="30"  maxlength="20"><p></p>
<input type="button" value="提交" onclick="ok()"/>
<input type=reset value="重置">
</form>
</center>
</body>
</html>

#include <stdio.h>
#include <stdlib.h>
#include<unistd.h>
#include<fcntl.h>
#include<string.h>
#include <time.h>

struct logindata{
        char username[20];
        char password[20];
};

struct userdata{
        char username[20];
        char password[20];
};
int main(void)
{
        FILE *userfp = NULL;
        char *date;
        struct logindata loginsave;
        struct userdata userread;

        printf("Content type: text/html;charset=gb2312\n\n");
        date = getenv("QUERY_STRING");
        if(date == NULL)
                printf("Data transmission error");
        else{
                sscanf(date,"username=%[^&]&password=%s",loginsave.username,loginsave.password);
                if((userfp = fopen("/config/user.conf","rw")) == NULL)  //wirte only
                {
                        printf("fail to open /config/user.conf file!\n");
                        return -1;
                }
                if((fread(&userread,sizeof(userread),1,userfp)) != 1)
                {
                        printf("read /config/user.conf faild");
                        fclose(userfp);
                        return -1;
                }
                if((strcmp(loginsave.username,userread.username)==0)&&(strcmp(loginsave.password,userread.password)==0))
                {
                        printf("login success");
                }
                else{
                        printf("username or password wrong\n");
                }
        }

        return 0;
}

javascript传递参数给cgi

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