Answered
I have a list that I want to make empty. With GeoGebraScript I just type
L_1 = {}
But I want to do it with javascript. I tried this, but it didnt work at all.
var L_1=ggbApplet.getValue("L_1");
ggbApplet.setListValue("L_1",1,{});
The same question 
ggbApplet.evalCommand("SetValue(l1,{})")
Note1: l1 must be a free object.
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