One time to understand JS's addition operation rules

Source: Internet
Author: User

To apply in order of precedence:

1, if there is an object in the operand, the object is converted to the original value (for example: [+] = ', {} = ' [Object Object] ', new Date () = Fri June 2018 09:49:28 gmt+ 0800 (China Standard Time));

2, if there is a string in the operand, the other value will be converted to a string;

3, in other cases, the operand is converted into a number to perform the addition operation.

Chestnuts:

1+ ' 2 '  //  '[1,2]+3  //  ' 1,23 'true   //    3+ {}  //  ' 11[object object] 'null  / /  2null  //  ' aanull '+ undefined  //    NaN

One time to understand JS's addition operation rules

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