unity3d - Unity: How to detect mouse click in a script without attaching the script to an object? -

in unity, using c#, how detect click anywhere in screen, without attaching script object?

to specific, looking individual clicks, not mouse downs.

e.g. code below checks mouse down, want clicks instead

// update called once per frame void update () {     // 1     vector3 currentposition = transform.position;     // 2     if( input.getbutton("fire1") ) {                 //             }      } 

you going need monobehaviour can use update() function advantage. attach empty gameobject, not uncommon game have 1 empty gameobject has few scripts handle things.

check getmouseup count clicks.