A simple example of how JavaScript implements the values of child parent forms

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window.showModalDialog () Use method:   var returnvalue = window.showmodaldialog (URL [, arguments] [, features]);   URL  --required parameter, type: String that specifies the URL   arguments  --optional parameter of the document to display in the dialog box, type: Variant, which is used to pass parameters to the dialog box, pass the parameter types, including arrays, etc. dialog box through window.dialogarguments to get the passed in parameters   features  --optional parameters, type: string, used to describe the appearance of the dialog box information, you can use the following one or several, with semicolons ";" Separated   dialogheight: dialog height, not less than 100px dialogwidth: Dialog width dialogleft: Distance from screen to left dialogtop: distance from screen center:{Yes | no | 1 | 0}: Yes No center, default Yes, but can still specify height and width    help:{yes | no | 1 | 0}: Show Help button, default Yes Resizable:{yes | no | 1 | 0} [ie5+]: can be changed to size No Status:{yes | no | 1 | 0} [ie5+]: Whether to display the status bar, default to yes[Modeless] or No[modal] scroll:{yes | no | 1 | 0 | on | off}: Show scroll bar, silently Think Yes   parameter pass:   1. To pass arguments to the dialog box, it is passed through arguments, the type is not limited, for the string type, the maximum is 4,096 characters, can also pass the object, for example: parent.htm     Code is as follows: <script>    var obj = new Object ();    obj.name= "justflyhigh.com";    window.showmodaldialog ("modal.htm", obj, "Dialogwidth=200px;dialogheight=100px ");   </script>     modal.htm   code is as follows: <script>  var obj = window.dialogarguments;  alert ("The parameter you passed is:" + obj.name) </script>   2. You can return information via window.returnvalue to the window that opens the dialog box, or object, for example:   parent.htm   Code as follows: <script>  var result = window.showModalDialog ("modal.htm", "dialogwidth=200px;dialogheight=100px");  alert (result); </script>   modal.htm code is as follows: <script>  window.returnvalue= "Http://www.jb51.net"; </script>