A brief analysis of the different performances of Javascript in IE and FireFox_javascript skills

1.document.formName.item("itemName") Problem
Description: Under IE, you can use document.formName.item("itemName") or document.formName.elements["elementName"]; under Firefox, you can only use Use document.formName.elements["elementName"].
Solution: Use document.formName.elements["elementName"] uniformly.
2. Collection class object problem
Explanation: Under IE, it can be used () or [] to obtain collection objects; under Firefox, you can only use [] to obtain collection objects.
Solution: Use [] uniformly to obtain collection objects.
3. Custom attribute issues
Note: Under IE, you can use the method of getting regular attributes to get custom attributes, or you can use getAttribute() to get custom attributes; under Firefox, you can only use getAttribute() to get custom attributes.
Solution: Unification Get custom attributes through getAttribute().
4.eval("idName") problem
Explanation: Under IE, you can use eval("idName") or getElementById("idName") to get the id as idName HTML object; under Firefox, you can only use getElementById("idName") to obtain the HTML object with the id idName.
Solution: Use getElementById("idName") uniformly to obtain the HTML object with the id idName.
5. The problem that the variable name is the same as the ID of an HTML object
Note: Under IE, the ID of the HTML object can be used directly as the variable name of the subordinate object of the document; it cannot be used under Firefox. Under Firefox, the ID of the HTML object can be used as the same as the HTML object ID. variable name; this is not possible under IE.
Solution: Use document.getElementById("idName") instead of document.idName. It is best not to use variable names with the same HTML object ID to reduce errors; always add var when declaring variables to avoid ambiguity.
7.Input.type attribute problem
Explanation: The input.type attribute under IE is read-only; but under Firefox, the input.type attribute is read-write.
9.event.x and event.y problem
Note: Under IE, the even object has x, y attributes, but no pageX, pageY attributes; under Firefox, the even object has pageX, pageY attributes, but no x, y attributes.
Solution: Use mX(mX = event.x ? event.x : event.pageX;) to replace event.x under IE or event.pageX under Firefox.
10.event.srcElement problem
Explanation: Under IE, the event object has srcElement attribute, but no target attribute; under Firefox, the event object has a target attribute, but no srcElement attribute.
Solution: use obj (obj = event.srcElement ? event.srcElement : event.target;) instead under IE event.srcElement or event.target under Firefox.
13.Frame problem
Take the following frame as an example:

(1) Access the frame object:
IE: Use window.frameId or window.frameName to access this frame object.
Firefox: You can only use window.frameName to access this frame object .
In addition, you can use window.document.getElementById("frameId") in both IE and Firefox to access this frame object.
(2) Switch frame content:
Can be used in both IE and Firefox Use window.document.getElementById("testFrame").src = "xxx.html" or window.frameName.location = "xxx.html" to switch the content of the frame.
If you need to pass the parameters in the frame back to the parent Window, you can use parent in frme to access the parent window. For example: parent.document.form1.filename.value="Aqing";
14.body problem
Firefox’s body exists before the body tag is fully read by the browser; while IE’s body must be The body tag does not exist until it is completely read by the browser.
For example:
Firefox:

Copy the code The code is as follows :

IE&Firefox:

Copy code The code is as follows:

15. Event delegation method
IE: document.body.onload = inject; //Function inject() has been implemented before this
Firefox: document.body. onload = inject();
Some people say the standard is:

Copy code The code is as follows:

document.body.onload=new Function('inject()');

16. The difference between the parent elements of firefox and IE (parentElement)
IE: obj.parentElement
firefox: obj.parentNode
Solution: Because both firefox and IE support DOM, obj is used. parentNode is a good choice.
17.innerText works normally in IE, but innerText does not work in FireFox.
Solution:

Copy code The code is as follows:

if(navigator.appName.indexOf("Explorer") > -1){
document.getElementById('element'). innerText = "my text";
} else{
document.getElementById('element').textContent = "my text";
}

18. Similar in FireFox The statement obj.style.height = imgObj.height is invalid
Solution:

Copy the code The code is as follows:

obj.style.height = imgObj.height 'px';

19. IE, Firefox and other browsers all operate the table tag differently. In IE Assignment of innerHTML values ​​​​to table and tr is not allowed. When adding a tr using js, the appendChile method does not work.
Solution:

Copy code The code is as follows:

//Append one to the table Empty row:
var row = otable.insertRow(-1);
var cell = document.createElement("td");
cell.innerHTML = " ";
cell.className = " XXXX";
row.appendChild(cell);

20. padding problem
padding 5px 4px 3px 1px FireFox cannot interpret the abbreviation,
must be changed to padding-top:5px ; padding-right:4px; padding-bottom:3px; padding-left:1px;
21. When eliminating the indentation of ul, ol and other lists, the
style should be written as: list-style:none; margin:0px ;padding:0px;
The margin attribute is valid for IE, and the padding attribute is valid for FireFox
22. CSS transparency
IE: filter:progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=60) .
FF:opacity:0.6.
23. CSS rounded corners
IE: Rounded corners are not supported.
FF: -moz-border-radius:4px, or -moz-border-radius-topleft:4px;-moz-border-radius-topright:4px;-moz-border-radius-bottomleft:4px;-moz -border-radius- bottomright:4px;.
24. CSS double-line bump border
IE: border:2px outset;.
FF: -moz-border-top-colors: #d4d0c8 white;-moz-border-left-colors: #d4d0c8 white;-moz-border-right-colors:#404040 #808080;-moz-border- bottom-colors:#404040 #808080;
25． IE supports document.all but Firefox does not support
Use one of the following three tags instead of document.all
getElementsByTagName("tagName") to get a collection of all tag elements
getElementById("idName ") You can get an element by id
getElementsByName("Name") You can get an element by name attribute
26. How to use innerHTML in firefox

Copy code The code is as follows:

document.all.online. innerHTML; //This method can be used in IE, but it is not a standard method
document.getElementById("online").innerHTML; //This way firefox can use innerHTML

27 , eval() and window.execScript() execute scripts
Both IE and firerox support eval(), but firefox does not support window.execScript()
Solution: Use eval() uniformly
28. Event processing Function rewriting
Solution: (Example): If you rewrite onclick() of document, use document.onclick = function(){…}