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单项选择题
A.window.getSelection ();
B.document.getSelection ();
C.document.createSelection ();
D.window.createSelection ();
单项选择题
A.addRange(range);
B.removeAllRanges();
C.removeRange(range);
D.getRangeAt(index);
单项选择题
A.selection.collapse();
B.selection.containsNode();
C.selection.collapseToEnd();
D.selection.collapseToStart();
问答题
问答题