Input text box input limit three

First, only numbers and decimal points are allowed.

 

Second, the judgment is more detailed, and even 22 .. 2 is not counted as a number.

 

 

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Only English letters, numbers, and underscores (_) are allowed)

 

Only English letters, numbers, and @ can be entered @

 

Only Chinese characters are allowed.

http://www.wesoho.com/article/asp/2479.htm">

 

Javascript allows only numbers.

 

 

1. Only numbers and decimal places are allowed.

 

 

3. Only integers are allowed. In fact, some restrictions can be made based on article 3.

    
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4. Only numbers are allowed.

 

Conclusion: The style = "ime-mode: Disabled is more practical. To disable the input method. The best effect is 3. input can be directly disabled. 4 is to be replaced after input. In this way, the input has the opportunity to press enter and unexpected results will occur.