javascript - jQuery中可以获取到图片的高度却无法获取宽度

$(document).ready(function() {

ko.validation.init({
            errorElementClass: 'has-error',
            insertMessages : true
        });
ko.validation.registerExtenders();

var dataUrl = {
        imgUrl : '/api/advertise/advertisepost'
    },
    loopPictures = $(".loopPictures"), 
    buttons = $(".buttons"),       
    imgYS = loopPictures.find("img"),
    imgWidth = imgYS.css("width"),
    imgHeight = imgYS.css("height"),
  
    kick = buttons.find("span");
    
    console.log(imgWidth);
    console.log(imgHeight);