大神们这个js怎么用转为jq啊，弟弟急

[qq_42655511]

function fnLogin() {
var oUname = document.getElementById("uname")
var oUpass = document.getElementById("upass")
var oError = document.getElementById("error_box")
var isError = true;
if (oUname.value.length > 20 || oUname.value.length < 6) {
oError.innerHTML = "用户名请输入6-20位字符";
isError = false;
return;
}else if((oUname.value.charCodeAt(0)>=48) && (oUname.value.charCodeAt(0)<=57)){
oError.innerHTML = "首字符必须为小写字母";
return;
}else for(var i=0;i<oUname.value.charCodeAt(i);i++){
if((oUname.value.charCodeAt(i)<48)||(oUname.value.charCodeAt(i)>57) && (oUname.value.charCodeAt(i)<97)||(oUname.value.charCodeAt(i)>122)){
oError.innerHTML = "必须为字母跟数字组成";
return;
}
}

if (oUpass.value.length > 20 || oUpass.value.length < 6) {
oError.innerHTML = "密码请输入6-20位字符"
isError = false;
return;
}
window.alert("登录成功")
}

[丰云]

    function fnLogin() {
        var oUname = $("#uname").val();
        var oUpass = $("#upass").val();
        var oError = $("#error_box");
        var isError = true;
        if (oUname.length > 20 || oUname.length < 6) {
            oError.html("用户名请输入6-20位字符");
            isError = false;
            return;
        } else if ((oUname.charCodeAt(0) >= 48) && (oUname.charCodeAt(0) <= 57)) {
            oError.html("首字符必须为小写字母");
            return;
        } else for (var i = 0; i < oUname.charCodeAt(i) ; i++) {
            if ((oUname.charCodeAt(i) < 48) || (oUname.charCodeAt(i) > 57) && (oUname.charCodeAt(i) < 97) || (oUname.charCodeAt(i) > 122)) {
                oError.html("必须为字母跟数字组成");
                return;
            }
        }

        if (oUpass.length > 20 || oUpass.length < 6) {
            oError.html("密码请输入6-20位字符");
            isError = false;
            return;
        }
        alert("登录成功")
    }