js中怎么对堆栈进行操作代码?
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<script type="text/javascript"> var stack = []; stack.push(2); // stack is now [2] stack.push(5); // stack is now [2, 5] var i = stack.pop(); // stack is now [2] alert(i); // displays 5 var queue = []; queue.push(2); // queue is now [2] queue.push(5); // queue is now [2, 5] var i = queue.shift(); // queue is now [5] alert(i); // displays 2 </script>