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JavaScript A simple way to determine whether a string is a number_javascript skills

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Release： 2016-05-16 18:49:21

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Copy code The code is as follows:

parseInt("Hello",10);//return NAN 
parseInt("110",10);//return 110 

So a simple way to determine whether a string is a number is to use isNaN(). If true is returned, then the character The string is not a number, otherwise it is a number

Copy code The code is as follows:

isNaN(parseInt( "Hello",10));//true; 
isNaN(parseInt("110",10));//false; 

Note: You cannot use the following method to judge:

Copy code The code is as follows:

parseInt("Hello",10)==NaN;// return false 
parseInt("110",10)==NaN;//return false 

Because NaN and itself do not want to wait, this is quite special. The way to judge NaN is isNaN() ;

Related labels：

javascript string number

source：php.cn

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