在Javascript中从关联数组中删除项目

Question

我的JS中有一个关联数组,我想提供我的Select.

这些是可用的标准时间,可以刷新我的可用时间(页面加载时);

var standardhours = {
  "09" : '9AM',
  "10" : '10AM',
  "11" : '11AM',
  "12" : 'Noon',
  "13" : '1PM',
  "14" : '2PM',
  "15" : '3PM',
  "16" : '4PM',
  "17" : '5PM',
  "18" : '6PM',
  "19" : '7PM'
};

这些是我想要为我的Select提供的可用时间.

var availablehours = {
    "09" : '9AM',
    "10" : '10AM',
    "11" : '11AM',
    "12" : 'Noon',
    "13" : '1PM',
    "14" : '2PM',
    "15" : '3PM',
    "16" : '4PM',
    "17" : '5PM',
    "18" : '6PM',
    "19" : '7PM'
};

这是我的动态变量,它根据数据库更改而变化.这些是已经有人花费的时间.

takenHours = {"09", "18"};

我想从availablehours关联数组中删除takenHours.不确定如何.我的思维过程非常简单.

Answer 1

如果我理解正确,那么你应该能够availablehours通过delete运算符实现这种变异,如图所示:

var availablehours = {
  "09": '9AM',
  "10": '10AM',
  "11": '11AM',
  "12": 'Noon',
  "13": '1PM',
  "14": '2PM',
  "15": '3PM',
  "16": '4PM',
  "17": '5PM',
  "18": '6PM',
  "19": '7PM'
};
console.log(availablehours);

var takenHours = ["09", "18"];

// Iterate through the hours to be removed
for (var takenHour of takenHours) {

  // For each hour key, use the delete operator to remove 
  // the key/value pair from availablehours completlty
  delete availablehours[takenHour]
}

// availablehours will no longer contain "09" or "18" key/value pairs
console.log(availablehours);