for(var i=0;i<adds.length;i++){ adds[i].addEventListener('click',function(){ console.log(itname[i]); }) }

这段代码的作用是为adds数组中的每一个元素添加一个点击事件监听器。当点击任何一个adds元素时，控制台会输出itname[i]的值，其中i为当前点击的adds元素在adds数组中的下标。

但是这段代码可能存在一个问题，因为在点击事件监听器的回调函数中，i的值是循环结束后的最终值，而不是当前点击的adds元素在数组中的下标。这可能会导致输出的itname[i]值不是预期的结果。为了避免这个问题，可以使用闭包来保存当前循环下标的值。例如：

for(var i=0;i<adds.length;i++){
  (function(index){
    adds[index].addEventListener('click',function(){
      console.log(itname[index]);
    });
  })(i);
}

这样，每一个回调函数都会保存当前循环下标的值，输出的itname[index]值就是预期的结果。

相关问题

count: function() { var that = this; var list = this.rbars; var allcount = 0; //被选中个数 var len = list.length; //加入购物车个数 var totalmoney = 0; var discount = 0; for(var i = 0; i < len; i++) { if(list[i].ischecked) { var c = list[i].count; //个数 allcount += parseInt(c); var p = list[i].price; totalmoney += c * p;

This code snippet seems to be a JavaScript function called "count". It starts by creating a variable "that" which is a reference to the current object (presumably the object that this function is a method of). It then creates another variable "list" which is presumably an array of items that this function is meant to count.

The function proceeds to initialize a few more variables: "allcount" (which will keep track of the total number of selected items), "len" (which is the length of the "list" array), "totalmoney" (which will keep track of the total cost of all selected items), and "discount" (which is currently set to 0 but may be used to track any discounts later in the function).

The function then proceeds to loop through each item in the "list" array using a for loop. For each item, it checks if the "ischecked" property is true (presumably indicating that the item has been selected). If it is, the function adds the item's count and price to the "allcount" and "totalmoney" variables, respectively.

The function then ends without returning anything. It is possible that this function is meant to update some UI elements on the page (e.g. displaying the total number of selected items or the total cost), but without more context it is difficult to say for sure.

解释代码 private ArrayList<String> flightSeats; public void setFlightSeats() { flightSeats = new ArrayList<String>(410); for (int i = 1; i <= 100; i++) { if (i <= 32) { this.flightSeats.add(i + "F-Booked"); } else { this.flightSeats.add(i + "F"); } } for (int i = 101; i <= 150; i++) { if (i <= 118) { this.flightSeats.add(i + "B-Booked"); } else { this.flightSeats.add(i + "B"); } } for (char c = 'A'; c <= 'Z'; c++) { for (int i = 1; i <= 10; i++) { if (c < 'O' || (c == 'N' && i <= 2)) { this.flightSeats.add(c + "" + i + "EC-Booked"); } else { this.flightSeats.add(c + "" + i + "EC"); } } } }

This code creates an ArrayList of Strings called "flightSeats" and initializes it with 410 elements. The ArrayList represents the seats on a flight. The method "setFlightSeats" populates the ArrayList with seat numbers and their availability status.

The first loop adds 100 seats starting from 1 and labels the first 32 seats as "F-Booked" and the rest as "F". The second loop adds seats 101 to 150 and labels the first 18 seats as "B-Booked" and the rest as "B".

The third loop adds seats from 'A' to 'Z' (26 rows) and from 1 to 10 (10 columns) and labels the seats in rows up to 'N' as "Economy-Booked", the seats in row 'N' as "Emergency-Exit" and the seats in rows after 'N' as "Economy".

Overall, this code initializes the ArrayList with seat numbers and their availability status for a flight, making it easier to manage and track seat availability.