Currently, support Delete key and arrow keys
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		@@ -5,7 +5,7 @@ $('li[contenteditable]').click(function(e) {
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});
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$('li[contenteditable]').on('keydown', function(e) {
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  if(e.keyCode !== 8 && isNaN(+e.key)) return e.preventDefault();
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  if([8, 37, 38, 39 ,40, 46].indexOf(e.keyCode) < 0 && isNaN(+e.key)) return e.preventDefault();
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});
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$('li[contenteditable]').on('keyup', function(e) {
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  $(this).data('val', /\d*/.exec($(this).html()));
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