Use js regular to control the input tag to only allow input values ​​_javascript skills

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This sentence is more practical. It means to close the input method. This will save some people from crying to you when they input numbers with full-width settings, but they can’t input them, blaming your poor design.

Only numbers are allowed

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< input name="username" type="text" onkeyup="value=this.value.replace(//D /g,'')">

Only English letters and numbers are allowed to be entered and underline (implemented by the following two methods)

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Only English letters, numbers and &=@ are allowed to be entered

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Only Chinese characters are allowed

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Example: Limit the input of three digits to numbers or '.' and turn off the input method in the input

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Discount