Passing variables to JavaScript with asp.net

Asp.net|javascript| variable

Method 1:

Use a hidden control, give the value of the variable to the hidden control, and then use JavaScript to find the value of the hidden control
Window.document.getElementById ("Hide the ID of the control"). Value//This will get the values of the hidden control

Method 2:
In javascript:
var value=<%=num%>

Num If a property
Such as:
Public String Num
{
Set{...}
Get{...}
}

If the character variable is a character type like alert (), use alert ("<%=Num%>").
and num must be public.