Javascript import include import data type judgment Function

The Code is as follows:

Function isAlien ()

{

Return isObject (a) & typeof a. constructor! = 'Function ';

}

Function isArray ()

{

Return isObject (a) & a. constructor = Array;

}

Function isBoolean ()

{

Return typeof a = 'boolean ';

}

Function isEmpty (o)

{

Var I, v;

If (isObject (o )){

For (I in o ){

V = o [I];

If (isUndefined (v) & isFunction (v )){

Return false;

}

}

}

Return true;

}

Function isFunction ()

{

Return typeof a = 'function ';

}

Function isNull ()

{

Return typeof a = 'object '&&! A;

}

Function isNumber ()

{

Return typeof a = 'number' & isFinite ();

}

Function isObject ()

{

Return (a & typeof a = 'object') | isFunction ();

}

Function isString ()

{

Return typeof a = 'string ';

}

Function isUndefined ()

{

Return typeof a = 'undefined ';

}

Function $ import (path, type, title)

{

Var s, I;

If (type = "js ")

{

Var ss = document. getElementsByTagName ("script ");

For (I = 0; I

{

If (ss [I]. src & ss [I]. src. indexOf (path )! =-1) return;

}

S = document. createElement ("script ");

S. type = "text/javascript ";

S. src = path;

}

Else if (type = "css ")

{

Var ls = document. getElementsByTagName ("link ");

For (I = 0; I

{

If (ls [I]. href & ls [I]. href. indexOf (path )! =-1) return;

}

S = document. createElement ("link ");

S. rel = "alternate stylesheet ";

S. type = "text/css ";

S. href = path;

S. title = title;

S. disabled = false;

}

Else return;

Var head = document. getElementsByTagName ("head") [0];

Head. appendChild (s );

}