@@ -1,14 +1,17 @@
 /*
  * 栈的实现
  */
-function Stack() {
+module.exports = function Stack() {
+    // 栈中的属性、方法
     this.dataStore = [];
+    // 栈顶计数
     this.top = 0;
     this.push = push;
     this.pop = pop;
     this.peek = peek;
     this.clear = clear;
-    this.length = length;
+    this.size = size;
+    this.isEmpty = isEmpty;
 }
 
 // 往栈中推入数据
@@ -32,7 +35,12 @@ function clear() {
 }
 
 // 返回栈的长度
-function length() {
+function size() {
     return this.top;
 }
 
+// 判断是否为空
+function isEmpty() {
+    return this.top === 0;
+}
+
@@ -0,0 +1,24 @@
+const Stack = require('./Stack');
+
+// 定义将10进制的数转换为2进制
+function dec2bin(decNumber) {
+    var stack = new Stack();
+    var remainder;
+
+    // 循环除法
+    while(decNumber > 0) {
+        remainder = decNumber % 2;
+        decNumber = Math.floor(decNumber / 2);
+        stack.push(remainder);
+    }
+    // 取出数据
+    var binStr = "";
+    while(!stack.isEmpty()) {
+        binStr += stack.pop();
+    }
+    console.log(binStr);
+    return binStr;
+}
+
+// 测试函数
+console.log(dec2bin(10));