Common methods of interaction in JavaScript

1.confirm message dialog box

Syntax: Confirm ("str");

Parameter description: STR is the text to be displayed in the dialog box,

Function: Usually to remind the user to make certain choices, its return value is Boolean type, click OK return value is ture, click Cancel return value is False

For example:

<script type= "Text/javascript" >    var mymessage=confirm ("Do you like JavaScript?");    if (mymessage==true)    {   document.write ("Very good, come on!");   }    else    {  document.write ("JS powerful, to learn Oh!");   } </script>

2.prompt message dialog box

Syntax: Prompt ("str1", "str2");

Parameter description: STR1 is the text to be displayed in the dialog box, cannot be modified, STR2 is the contents of the text box, you can modify

Role: Pop up a dialog box asking for information about interacting with the user

For example:

var myname=prompt ("Please enter your name:");

if (myname!=null)  {   alert ("Hello" +myname);} else  {  alert ("Hello my friend.");  

3.window.open Opening a new window

Syntax: window.open (' str1 ', ' str2 ', ' str3 ');

Parameter description: STR1 is the address of the window you want to open; str2 is the name of the window you want to open; STR3 is the parameter of the control window

Role: Open a new window

For example:

<script type= "Text/javascript" >

window.open (' http://www.imooc.com ', ' _blank ', ' width=300,height=200,menubar=no,toolbar=no, status=no,scrollbars= Yes ') </script>

4.window.close Close a new window

Syntax: window.close (' str '), or < new window >.close ();

Parameter description: STR is the address of the open window

For example:

<script type= "Text/javascript" >   var mywin=window.open (' http://www.imooc.com ');//The newly-hit window object, stored in the variable Mywin   mywin.close ();</script>

5.alert Warning

Syntax: alert ("str");//note is double quotation marks

Parameter description: What str pops up for the dialog box

For example:

<script type= "Text/javascript" > var mynum = 30; Alert ("hello!"); Alert (mynum);</script>

6.document.write Output Content

Syntax: document.write ("str")

Function: Output text str

For example:

</pre><pre name= "Code" class= "JavaScript" ><script type= "Text/javascript" >  document.write ("I Love javascript! "); Content is output directly from the content in "", "". </script>

Common methods of interaction in JavaScript