support deleting 5
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@@ -365,6 +365,16 @@ function nextstep() {
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stage.find('#nullptr').show();
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layer.draw();
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}else if(key == 5){
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// move 7.5 to 5
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stage.find('#node_'+7.5).x(650);
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stage.find('#node_'+7.5).y(100);
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stage.find('#node_text_'+7.5).x(645);
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stage.find('#node_text_'+7.5).y(90);
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// hide 7.5 node, and show a NULL pointer.
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stage.find('#nullptr').x(770);
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stage.find('#nullptr').y(390);
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stage.find('#nullptr').show();
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layer.draw();
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}else if(key == 8){
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line5.hide();
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stage.find('#node_'+key).hide();
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