用jQuery库-

使用.width()和.height()。

更多jQuery宽度和jQuery高度。

示例代码:

$(文档)时函数(){ $("按钮”).click(函数() ｛ alert(”图像的宽度 : " + $("# img_exmpl”).width ()); alert("形象的高度 : " + $("# img_exmpl”).height ()); })； })； < script src = " https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js " > < /脚本> <img id="img_exmpl" src="http://images.all-free-download.com/images/graphicthumb/beauty_of_nature_9_210287.jpg"> <button> img显示尺寸</button>

这是我的方法:

var imgSrc, imgW, imgH;

function myFunction(image) {
    var img = new Image();
    img.src = image;
    img.onload = function() {
        return {
            src: image,
            width: this.width,
            height: this.height};
        }
    return img;
}

var x = myFunction('http://www.google.com/intl/en_ALL/images/logo.gif');
    // Waiting for the image loaded. Otherwise, system returned 0 as both width and height.
x.addEventListener('load', function() {
    imgSrc = x.src;
    imgW = x.width;
    imgH = x.height;
});

x.addEventListener('load', function() {
    console.log(imgW + 'x' + imgH); // 276x110
});
console.log(imgW); // undefined.
console.log(imgH); // undefined.
console.log(imgSrc); // undefined.

如果你正在使用jQuery并且你正在请求图像大小，你必须等待它们加载，否则你只会得到零。

$(document).ready(function() {
    $("img").load(function() {
        alert($(this).height());
        alert($(this).width());
    });
});

const file = event.target.files[0];
const img = new Image();
img.onload = function () {
  width = img.width;
  height = img.height;
};
img.src = URL.createObjectURL(file);
alert(width + "x" + height);

简单地说，您可以像这样进行测试。

  <script>
  (function($) {
        $(document).ready(function() {
            console.log("ready....");
            var i = 0;
            var img;
            for(i=1; i<13; i++) {
                img = new Image();
                img.src = 'img/' + i + '.jpg';
                console.log("name : " + img.src);
                img.onload = function() {
                    if(this.height > this.width) {
                        console.log(this.src + " : portrait");
                    }
                    else if(this.width > this.height) {
                        console.log(this.src + " : landscape");
                    }
                    else {
                        console.log(this.src + " : square");
                    }
                }
            }
        });
    }(jQuery));
  </script>

Use

function outmeInside() {
    var output = document.getElementById('preview_product_image');

    if (this.height < 600 || this.width < 600) {
        output.src = "http://localhost/danieladenew/uploads/no-photo.jpg";
        alert("The image you have selected is low resolution image. Your image width=" + this.width + ", height=" + this.height + ". Please select image greater or equal to 600x600. Thanks!");
    }
    else {
        output.src = URL.createObjectURL(event.target.files[0]);
    }
    return;
}



    img.src = URL.createObjectURL(event.target.files[0]);
}

这适用于多个图像预览和上传。如果你必须为每个图像逐一选择，然后复制粘贴到所有预览图像功能和验证!!