Common JavaScript errors

Beginners JavaScript, every day is always a small problem for a long time, tonight there are several small problems.

First: Use double quotes all to create a matching error

<input type= "checkbox" onmouseover= "document.getElementById (" Test "). Style.display=" None ":"/>

The change has been reported error: unexpected Toke "}" check for half a day did not find errors, the control found that the video is using single quotation marks

<input type= "checkbox" onmouseover= "document.getElementById (' Test '). style.display=" None ":"/>

After changing to single quotation marks, the mistake finally eliminated, troubled me one night. Attached link http://www.cnblogs.com/chinabc/archive/2010/11/19/1881947.html

Second: Error adding semicolon

<div id= "test" class= "Test1" onmouseover= "Toyellow ()"; onmouseout= "tored ()";>change</div>

Write a semicolon, resulting in the code after the semicolon does not execute

Third: Write more parentheses after the function name

<script>function Toyellow () {    document.getElementById ("test"). Classname= "Test2";} function tored () {      document.getElementById ("test"). Classname= "Test1";} document.getElementById ("Test"). Onmouseover=toyellow ();d Ocument.getelementbyid ("test"). Onmouseout=tored ();< /script>   

Toyellow () and tored () after the parentheses are executed normally

IV: Checked Property modification of checkbox

　Use three buttons to select all, select, and reverse the checkbox.

<! DOCTYPE html>
　　
Common JavaScript errors