JS快速获取图片宽高的方法

// 记录当前时间戳
var start_time = new Date().getTime();
// 图片地址
var img_url = 'http://b.zol-img.com.cn/desk/bizhi/image/2/2560x1600/1365477614755.jpg?' + start_time;
// 创建对象
var img = new Image();
// 改变图片的src
img.src = img_url;
// 定时执行获取宽高
var check = function () {
    // 只要任何一方大于0
    // 表示已经服务器已经返回宽高
    if (img.width & gt; 0 || img.height & gt; 0) {
        var diff = new Date().getTime() - start_time;
        document.body.innerHTML += 'from:check : width:' + img.width + ',height:' + img.height + ', time:' + diff +
            'ms';
        clearInterval(set);
    }
};
var set = setInterval(check, 40);
// 加载完成获取宽高
img.onload = function () {
    var diff = new Date().getTime() - start_time;
    document.body.innerHTML += 'from:onload : width:' + img.width + ',height:' + img.height + ', time:' + diff +
        'ms';
};