//var chx = this.getChildAt(0)
//var chy = this.getChildAt(1)
//var chz = this.getChildAt(2)
//this.removeChildren(0, 1)
//this.getChildAt(0) === chz
true
//this.numChildren
1
//this.removeChildren(1)
//this.numChildren
1
//this.removeChildren(100)
//this.numChildren
1
//this.removeChildren(0,0x7fffffff)
//this.numChildren
0
//this.removeChildren()
//this.removeChildren(0, 0)
RangeError 2006
//this.numChildren
0
//var chx = this.getChildAt(0)
//var chy = this.getChildAt(1)
//var chz = this.getChildAt(2)
//this.removeChildren(1)
//this.getChildAt(0) === chx
true
//this.numChildren
1
//this.removeChildren()
//this.numChildren
0
//var chx = this.getChildAt(0)
//var chy = this.getChildAt(1)
//var chz = this.getChildAt(2)
//this.removeChildren(0, 0)
//this.getChildAt(0) === chy
true
//this.getChildAt(1) === chz
true
//this.numChildren
2
//this.removeChildren(0, 0)
//this.getChildAt(0) === chz
true
//this.numChildren
1
//this.removeChildren(0, 0)
//this.numChildren
0
