Measure the test taker's knowledge about the javascript string judgment method.

This article describes the javascript string judgment methods. The judgment symbols in Javascript mainly include: = ,! =, = ,! =

= ,! = The two symbols are converted to the variable type before judgment. If the two symbols are of the same type, the values are compared;

=== ,! = This is to directly determine the types of the two variables. If the types are different, the system will directly judge and not compare the values.

Demo:

Function bijiao (){

Var str = "123 ";

Var num = 123;

Var char = '20140901 ';

Alert (srt = num); // true

Alert (str = char); // true

Alert (str = num); // false

Alert (str! = Num); // true

}

The above is a detailed description of the javascript string judgment method. For more information, see other related articles in the first PHP community!