.diff不是Moment.js中的函数

Question

I'm trying to get the difference between two dates, but I'm getting the response: Uncaught TypeError: x.diff is not a function On other topics I've seen I have to create a moment object, but for as far as I know, I'm doing that. Code:

function datecheck(){
  var y = moment($("#input_pickup_date").val(),"L").format("L");
  var x = moment().format("L");
  console.log(x.diff(y, 'days'));
}

Answer 1

Via the docs , moment().format() returns a String, so your x and y variables are both Strings. If you need to both do calculations on and display the values, separate them out into different variables:

function datecheck() {
    var dateSubmitted = moment($("#input_pickup_date").val(), "L"), //your old x variable
        now = moment(), //your old y variable
        dateSubmittedDisplay = dateSubmitted.format("L"), //a string representing the submitted date in the format you wanted.
        nowDisplay = now.format("L"); //a string representing now in the format you wanted.

    console.log(x.diff(y, 'days'));
}