Differences between JavaScript on IE and Firefox and alternative implementation methods _ javascript skills

We often encounter compatibility issues when dealing with js in ie and firefox. The following is a summary, I hope you can take a closer look at the research. We often encounter some compatibility problems when dealing with js in ie and firefox. The following is a summary. I hope you can take a closer look at the research.

1.doc ument. formName. item ("itemName ")

Description: 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

Note: 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

Note: 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: getAttribute () is used to obtain custom attributes.

4. eval ("idName") Problems

Note: 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.

Note: In IE, the ID of the HTML object can be used directly as the variable name of the subordinate object of the document; in Firefox, it cannot. in Firefox, you can use the same variable name as the HTML Object ID; in IE, you cannot.
Solution: Use document. getElementById ("idName") replaces document. idName. we recommend that you do not use variable names with the same HTML Object ID to reduce errors. When declaring variables, add var to avoid ambiguity.

6. const Problems

Note: 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

Description: The input. type attribute in IE is read-only, but the input. type attribute in Firefox is read/write.

8. window. event Problems

Note: window. event can only be run in IE, but not in Firefox, because Firefox event can only be used in the event.
Solution:
IE:

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