PowerShell小技巧实现IE Web自动化

#
# 打开IE窗口
#
function New-IEWindow
{
  param(
  [string]$Url,
  [switch]$Visible,
  [switch]$FullScreen
  )
  $Global:IEHost = new-object -com "InternetExplorer.Application"
  $Global:IEHost.Navigate($Url)
 
  #设置IE可见性和全屏
  $Global:IEhost.Visible= $Visible
  $Global:IEHost.FullScreen= $FullScreen
   
}
 
#
#等待IE加载完毕
#
function Wait-IEReady([int]$TimeoutSeconds=10)
{
  $milliseconds=0
  $maxMilliseconds = $TimeoutSeconds * 1000
  while($Global:IEHost.Busy)
  {
    
   if($milliseconds -gt $maxMilliseconds)
   {
    throw 'Wait ie ready timeout.'
   }
   sleep -Milliseconds 100
   $milliseconds+=100
    
  }
}
 
#
# 根据ID，Class，Name，Tag获取HTML元素
#
function Get-HtmlElement ($Id,$Name,$Class,$Tag)
{
 if($Id)
 {
  return $IEHost.Document.getElementById($id)
 }
 elseif($Name)
 {
  return $IEHost.Document.getElementsByName($Name)
 }
 elseif($Class)
 {
  $IEHost.Document.all |　where {$_.className -contains $Class}
 }
 elseif($Tag)
 {
  $IEHost.Document.getElementsByTagName($Tag)
 }
  
}
 
#
#关闭IE窗口
#
function Close-IEWindow
{
  $Global:IEHost.quit()
  Remove-Variable IEHost -Force
}
 
#
#设置IE的地址
#
function Navigate-IE($Url)
{
 Set-IE -URL $Url
}
 
#
# 设置IE的地址，或者动作：前进，倒退，刷新
#
function Set-IE
{
 param(
 [ValidateSet('GoBack', 'GoForward','Refresh')]
 [string]$Action,
 [uri]$URL
 )
 
 # 动作
 switch($Action)
 {
 ('GoBack'){ $Global:IEHost.GoBack() }
 ('GoForward'){ $Global:IEHost.GoForward() }
 ('Refresh'){ $Global:IEHost.Refresh() }
 }
 
 # 设置IE地址
 if( $URL) {
 $Global:IEHost.Navigate($URL) }
}
 
#
# 在IE窗口中执行脚本
#
function Invoke-IEScript($Code,$Language='Javascript')
{
 if( -not [string]::IsNullOrWhiteSpace($Code))
 {
 $Global:IEHost.Document.parentWindow.execScript($Code,$Language)
 }
}