基于邏輯運算的簡單權限系統(實現) JS 版
2019-11-21 02:11:51
供稿：網友
作者: slightboy, 時間: 2006-10-17
此篇為 JS 實現版本, 以前作已交待原理 故不在此多做解釋
如需原理介紹 請查看 VBS 版.
var PermissionType =
{
Read : 1,
Write : 2,
Delete : 4
}
function PermissionSetComponent(value)
{
this.Value = value;
this.getRead = function()
{
return this.getValue(PermissionType.Read);
}
this.setRead = function(value)
{
this.setValue(PermissionType.Read, 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: 紅色部分為 java 風格寫法 不是本例所必須.
只是做一個展示, 如果你比較喜歡 java 風格也可以選擇這種寫法.
