score:0
first, you have an error in
<input type="submit" value="check" onclick={this._showmessage{this._checkvalue} />
next,
<input>
boxes in react works a little bit differently.
check out this link
score:2
you have a typo in your code:
_checkvalue() {
if (evt.taget.value != number) {
// -------^ should be target
also, number.isnan would be a more robust comparison.
Source: stackoverflow.com
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