Question

我正在尝试连接并显示小时，分钟和秒，但它们会像整数一样添加而不是连接。我做错了什么？

var date = new Date();
  //return 
  console.log(
  date.getHours()<10 ? "0"+date.getHours() : date.getHours().toString() 
  + date.getMinutes()<10 ? "0"+date.getMinutes(): date.getMinutes().toString() 
  + date.getSeconds() < 10 ? "0" + date.getSeconds(): date.getSeconds().toString());

我得到一个像13这样的数字，而不是像012208那样的时间

Answer 1

＆＃13;

var date = new Date();
  //return 
  console.log(
  (date.getHours()<10 ? "0"+date.getHours() : date.getHours().toString() )
  + (date.getMinutes()<10 ? "0"+date.getMinutes(): date.getMinutes().toString()) 
  + (date.getSeconds() < 10 ? "0" + date.getSeconds(): date.getSeconds().toString()));

＆＃13;

在这里。检查括号

Answer 2

问题在于您在三元运算符中使用的优先级。

console.log((date.getHours()<10 ? "0"+date.getHours() : date.getHours().toString())+ (date.getMinutes()<10 ? "0"+date.getMinutes(): date.getMinutes().toString()) + (date.getSeconds() < 10 ? "0" + date.getSeconds(): date.getSeconds().toString()));

这可以解决您的问题

Answer 3

试试这个，你没有关闭ternary运算符

var date = new Date();
//return 

    var h = date.getHours() < 10 ? "0" + date.getHours() : date.getHours().toString();
    var min = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes().toString();
    var sec = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds().toString(); console.log(h +':'+ min +':'+ sec)

Answer 4

你忘记了括号：

console.log(
      (date.getHours() < 10 ? '0' + date.getHours().toString() : date.getHours().toString()) +
      (date.getMinutes() < 10 ? '0' + date.getMinutes().toString() : date.getMinutes().toString()) +
        (date.getSeconds() < 10 ? '0' + date.getSeconds().toString() : date.getSeconds().toString()) );

Answer 5

您需要在条件周围添加括号。正如你现在拥有的那样，它正在执行，就好像它是：

＆＃13;

function dateStr(date) {
  var hoursStr, minutesStr, secondsStr;
  
  if (date.getHours() < 10) {
  
      hoursStr = "0" + date.getHours();
    
  } else {
  
      if (date.getMinutes() < 10) {

          minutesStr = "0" + date.getMinutes();

      } else {

          if ( date.getSeconds() < 10) {

              secondsStr = "0" + date.getSeconds();

          } else {

              secondsStr = date.getSeconds().toString();

          }

          minutesStr = date.getMinutes().toString() + secondsStr;

      }

      hoursStr = date.getHours().toString() + minutesStr;
    
  } 
  
  return hoursStr;
}

var date = new Date();
// If the hours/minutes/seconds are 10 or more you will get what you want
date.setHours(10);
date.setMinutes(10);
date.setSeconds(10);

console.log(dateStr(date)); // => "101010"

// If the minutes are less than 10, no seconds show
date.setMinutes(5);
console.log(dateStr(date)); // => "1005"

// If the hours are less than 10, no minutes or seconds show
date.setHours(4);
console.log(dateStr(date)); // => "04"

＆＃13;

通过在条件语句周围添加括号，可以更正操作顺序：

＆＃13;

var date = new Date();
console.log(
  (date.getHours() < 10 ? "0" + date.getHours() : date.getHours().toString()) +
  (date.getMinutes() < 10 ? "0" + date.getMinutes(): date.getMinutes().toString()) +
  (date.getSeconds() < 10 ? "0" + date.getSeconds(): date.getSeconds().toString())
);

＆＃13;

添加字符串而不是连接

5 个答案: