基于逻辑运算的简单权限系统(实现) JS 版

作者: slightboy, 时间: 2006-10-17

此篇为 JS 实现版本, 以前作已交待原理 故不在此多做解释

如需原理介绍 请查看 VBS 版.

 首发于: http://cs.alienwave.cn/Topic/356.aspx

var PermissionType =
{
Read : 1,
Write : 2,
Delete : 4
}

function PermissionSetComponent(value)
{
this.Value = value;

this.Read = function()
{
if (arguments.length > 0)
this.setValue(PermissionType.Read, arguments[0]);
else
return this.getValue(PermissionType.Read);
}

this.Write = function()
{
if (arguments.length > 0)
this.setValue(PermissionType.Write, arguments[0]);
else
return this.getValue(PermissionType.Write);
}

this.Delete = function()
{
if (arguments.length > 0)
this.setValue(PermissionType.Delete, arguments[0]);
else
return this.getValue(PermissionType.Delete);
}

this.getValue = function(permissionType)
{
return (this.Value & permissionType) == permissionType;
}

this.setValue = function(permissionType, value)
{
if (value)
this.Value |= permissionType;
else
this.Value &= ~permissionType;
}
}

var PermissionSet = new PermissionSetComponent(0);

w("Read:");
PermissionSet.Read(false);
w(PermissionSet.Value +" "+ PermissionSet.Read());

PermissionSet.Read(true);
w(PermissionSet.Value +" "+ PermissionSet.Read());

w("Write:");
PermissionSet.Write(false);
w(PermissionSet.Value +" "+ PermissionSet.Write());

PermissionSet.Write(true);
w(PermissionSet.Value +" "+ PermissionSet.Write());

w("Delete:");
PermissionSet.Delete(false);
w(PermissionSet.Value +" "+ PermissionSet.Delete());

PermissionSet.Delete(true);
w(PermissionSet.Value +" "+ PermissionSet.Delete());

function w(o)
{
Response.Write(o +"<br />");
}

注: 红色部分为 java 风格写法 不是本例所必须.

只是做一个展示, 如果你比较喜欢 java 风格也可以选择这种写法.