var cashRegister = { total:0, add: function(itemCost){ this.total += itemCost; }, scan: function(item,time) { switch (item) { case "eggs": for (var i = 0;i <= time - 1;i++) {this.add(0.98);}; break; case "milk": for (var j = 0;j <= time - 1;j++) {this.add(1.23);}; break; case "magazine": for (var k = 0;k <= time - 1;k++) {this.add(4.99);}; break; case "chocolate": for (var l = 0;l <= time - 1;l++) {this.add(0.45);}; break; // 上面的代码错在哪里,为什么不能正确实现(下面是可以实现功能的代码) // case "eggs": this.add(0.98 * time); break; // case "milk": this.add(1.23 * time); break; // case "magazine": this.add(4.99 * time); break; // case "chocolate": this.add(0.45 * time); break; } }};// scan each item 4 timesvar myArr = ["eggs","milk","magazine","chocolate"];for ( var m = 0;m <= myArr.length - 1 ; m++ ) { cashRegister.scan(myArr[m],4);};//Show the total billconsole.log('Your bill is '+cashRegister.total);
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