<li ng-class="{on: onSw==true}">
???</script>
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業(yè)精于勤，荒于嬉;行成于思，毀于隨。
li?? ng-repeat? ???? ??
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??? ? ??? onSw? ???? ???? ???? $index
????? ??? ?? ???? $scope.items[index]? ?????. .onSw=true
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