js物件導向寫法及棧的實現

標籤：span   ack   asto   物件導向   his   注意   style   ddd   i++   

 1 function Stack() { 2   this.dataStore = []; 3   this.top = 0; //指向棧頂的位置 4   this.push = push; 5   this.pop = pop; 6   this.peek = peek; 7   this.clear = clear; 8   this.length = length; 9   10   function push(element) {11     this.dataStore[this.top++] = element; //先賦值後++12   }13   14   function peek() {15     return this.dataStore[this.top - 1];16   }17 18   function pop() {19     return this.dataStore[--this.top]; //先--運算20   }21 22   function clear() {23     this.top = 0;24   }25 26   function length() {27     return this.top;28   }29 }30 31 var s = new Stack(); 32 s.push("David"); 33 s.push("Raymond"); 34 s.push("Bryan"); 35 console.log(s);36 console.log("length: " + s.length()); 

 

  注意：這樣的一步操作arr[i++]="ddd";----》這裡的執行順序是：先執行賦值後進行的++運算等價於下面的兩布操作：arr[i] = "ddd";i++;  //這樣寫才是先執行++運算 arr[++i]="ddd";

js物件導向寫法及棧的實現