作者: slightboy, 時(shí)間: 2006-10-17
此篇為 JS 實(shí)現(xiàn)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(qǐng)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(fēng)格寫(xiě)法 不是本例所必須.
只是做一個(gè)展示, 如果你比較喜歡 java 風(fēng)格也可以選擇這種寫(xiě)法.

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