Differences between js in IE and firefox highlights _ basic knowledge

This article summarizes the differences between js in IE and Firefox environments and the methods for solving problems. It is very detailed and practical. If you need it, you can take it with yourself. firefox cannot support innerText.
Firefox supports innerHTML but does not support innerText. It supports textContent to implement innerText, but by default, redundant spaces are retained. If textContent is not required, you can use innerHTML instead if the string does not contain HTML code.

2. Prohibit the selection of webpage content:
Js: obj. onselectstart = function () {return false;} is generally used in IE ;}
Firefox uses CSS:-moz-user-select: none

3. Filter support (for example, transparent filter ):
IE: filter: alpha (opacity = 10 );
Firefox:-moz-opacity:. 10;

4. Capture events:
IE: obj. setCapture (), obj. releaseCapture ()
Firefox: document. addEventListener ("mousemove", mousemovefunction, true );
Document. removeEventListener ("mousemove", mousemovefunction, true );

5. Get the mouse position:
IE: event. clientX, event. clientY
Firefox: The event object needs to be passed by the event function.
Obj. onmousemove = function (ev ){
X = ev. pageX; Y = ev. pageY;
}

6. Limitations of DIV and other elements:
For example, set a p CSS: {width: 100px; height: 100px; border: #000000 1px solid ;}
In IE: width of p (including Border width): 100px, height of p (including Border width): 100px;
Firefox: the width of p (including the Border width): 102px, the height of p (including the Border width): 102px;

So when we drag windows compatible with IE and firefox, we need to use some brains to write js and css, and give you two tips.

1. Determine the browser type:
Var isIE = document. all? True: false;
I wrote a variable. If the document. all syntax is supported, isIE = true; otherwise, isIE = false.

2. CSS processing in different browsers:
Generally, it can be used! Important Uses css statements first (only supported by firefox)
For example: {border-width: 0px! Important; border-width: 1px ;}
In firefox, this element has no border, and the Border Width under IE is 1px.

1.doc ument. formName. item ("itemName ")
Problem description: in IE, you can use document. formName. item ("itemName") or document. formName. elements ["elementName"]; In Firefox, only document. formName. elements ["elementName"].
Solution: Use document. formName. elements ["elementName"].

2. Collection class Object Problems
Problem description: in IE, you can use () or [] to obtain collection class objects. In Firefox, you can only use [] to obtain collection class objects.
Solution: use [] to retrieve collection class objects.

3. Custom Attributes
Problem description: in IE, you can use the method to obtain general attributes to obtain custom attributes, or use getAttribute () to obtain Custom Attributes. In Firefox, you can only use getAttribute () obtain custom attributes.
Solution: Get custom attributes through getAttribute.

4. eval ("idName") Problems
Problem description: in IE, you can use eval ("idName") or getElementById ("idName") to obtain the HTML object whose id is idName; in Firefox, you can only use getElementById ("idName") to obtain the HTML object whose id is idName.
Solution: getElementById ("idName") is used to retrieve the HTML object whose id is idName.

5. The variable name is the same as the ID of an HTML object.
Problem description: in IE, the ID of the HTML object can be used directly as the variable name of the subordinate object of the document, but not in Firefox. In Firefox, the variable name that is the same as the ID of the HTML object can be used, IE.
Solution: Use document. getElementById ("idName") to replace document. idName. We recommend that you do not use variable names with the same HTML Object ID to reduce errors. When declaring variables, add the var keyword to avoid ambiguity.

6. const Problems
Problem description: In Firefox, you can use the const keyword or var keyword to define constants. in IE, you can only use the var keyword to define constants.
Solution: Use the var keyword to define constants.

7. input. type attribute Problems
Problem description: The input. type attribute in IE is read-only, but the input. type attribute in Firefox is read/write.
Solution: do not modify the input. type attribute. If you must modify it, You can first hide the original input, and then insert a new input element at the same position.

8. window. event Problems
Problem description: window. event can only be run in IE, but not in Firefox, because Firefox event can only be used in the event.
Solution: add the event parameter to the function where the event occurs and use var myEvent = evt? Evt :( window. event? Window. event: null)
Example:

The Code is as follows: