php登录验证+MD5

测试网站：http://www.aqfun.cn/my_test/testphp/login.html

1.js:添加验证码一种方法

var code;
function createCode() {
    code = "";
    var codeLength = 4; //验证码的长度
    var checkCode = document.getElementById("checkCode");
    var codeChars = new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
        'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'); //所有候选组成验证码的字符，当然也可以用中文的
    for (var i = 0; i < codeLength; i++)
    {
        var charNum = Math.floor(Math.random() * 52);
        code += codeChars[charNum];
    }
    if (checkCode)
    {
        checkCode.className = "code";
        checkCode.innerHTML = code;
    }
}
function validateCode() {
    var oinputCode = document.getElementById("vCode")
	var ouser= document.getElementById("name")
	var opass= document.getElementById("password")
	if (ouser.value==''){
		 alert("请输入用户！");
		 ouser.focus();
		 return false;
    } else if(opass.value==''){
		alert("请输入密码");
		opass.focus();
		return false;
    } else if (oinputCode.value == '') {
        alert("请输入验证码！");
		oinputCode.focus();
		return false;
    } else if (oinputCode.value.toLowerCase() != code.toLowerCase()) {
        alert("输入验证码有误");
		createCode();
		oinputCode.value="";
		oinputCode.focus();
		return false;
		
    }
    else{
		oinputCode.value="";
		return true;
    }

}

login.html:简单的一个布局

  

<


  


登录
  
name:
  
password:
  
passcode:


  
  
  

 home.php:登录成功后的主页