In fact, this example is not difficult, only a more special usage of Window.Open (), the process is this: first open a window, then write a piece of code (ie, the parameter code) to this window. The OPEN () method is explained below.
First look at the usage: newwin = window.open ('url', 'name', 'features');
NEWIN is a variable of a Window object, representing a new window, we can use newwin to call this window for a certain operation, such as newwin.close () (close the window); URL is the URL of the file opened; Name is The name of the window; Features is a string that represents the properties of the new window, there are multiple options, separated by commas, such as: window.Open ('url', 'name', 'width = 400, height = 300') . The following is listed below attributes in the new window in IE4 (including IE4) (ie, fetures in the above parameters):
Attribute value / unit expressed meaning
Toolbar Yes / No. / 1/0 toolbar
Location Yes / No / 1/0 Address Bar
Font-size font size, syntax with CSS, such as Font-size: 12px
Font-Weight defines a variety of fonts
Font-Style uses a variety of font properties
EdgeStyle Raised / Sunken Window Border Style
Bordersize Thick / Thin Window Size Border Size
Helpicon Yes / No / 1/0 Whether to display help icon in the title bar
Minimize Yes / No / 1/0 Whether to display a small icon in the title bar
Maxnimize Yes / No / 1/0 Whether to display a large icon in the title bar
SystemMENU YES / NO / 1/0 System menu is valid in the border icon
Directories YES / NO / 1/0 Directory Icon
STATUS YES / NO / 1/0 window bottom status line
MenuBar YES / NO / 1/0 menu
Scrollbars Yes / NO / 1/0 allows horizontal and vertical scrolling
Resizealbe Yes / No / 1/0 Can change the window size
Width PX window width
HEIGHT PX window height
Top PX relative to the top position of the desktop
LEFT PX is relative to the left side of the window
Center Yes / NO / 1/0 relative to the center position of the desktop
The above, a more detailed explanation for Window.Open (), which is a more special usage, which is used in this example. Let's take a look at the only two lines of code of the runcode () function:
Var newwin = window.open ('', '', '');
Newwin.document.writeln (code);
The first sentence has been described above, that is, open a window. But there is no parameters here. If there is no next sentence, it will open a new window with his parent window, then let's take a look at what is the meaning of the next sentence? Newwin is a variable of the new window, which means that it must be a new open window. Document.writeln () is an output statement, code is a parameter, that is, the code to run. Then, newwin.document.writeln (code) means writing to the newly opened window, in other words, the Code code also shows its effect in the new window, thus implementing "running" The function of the code. This section, this is the end, is it very simple?
