=, And! In javascript ,! = ,! = Operator

=: Value assignment
=: Determines whether the values are equal, but not strictly equal. It only determines whether the values are equal and does not determine the type. For example:

<Script>
Var a = 1;
Var B = '1 ';
If (a = B)
Alert (true );
</Script>
<Script>
Var a = 1;
Var B = '1 ';
If (a = B)
Alert (true );
</Script>

The result is displayed as true;

===: The values and types are equal. For example:

<Script>
Var a = 1;
Var B = '1 ';
If (a = B)
Alert (true );
Else
Alert (false );
</Script>
<Script>
Var a = 1;
Var B = '1 ';
If (a = B)
Alert (true );
Else
Alert (false );
</Script>

The result is displayed as false:

Similarly ,! = Is not strictly unequal to judgment! = Is a strict unequal judgment; for example:

<Script>
Var a = 1;
Var B = '1 ';
If (! = B)
Alert (true );
Else
Alert (false );
</Script>
<Script>
Var a = 1;
Var B = '1 ';
If (! = B)
Alert (true );
Else
Alert (false );
</Script>

Displayed as false
The following code

<Script>
Var a = 1;
Var B = '1 ';
If (! = B)
Alert (true );
Else
Alert (false );
</Script>
<Script>
Var a = 1;
Var B = '1 ';
If (! = B)
Alert (true );
Else
Alert (false );
</Script>

Displayed as true

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