下面有几个方法,本质上都是在内存中创建一个图片,获取这个图片的属性.
方法一,原生的,对于已缓存的和动态加载的都可以
Demo: http://jsfiddle.net/9543z/2/
function LoadImage(imgSrc, callback){
var image = new Image();
image.src = imgSrc;
if (image.complete) {
callback(image);
image.onload=function(){};
} else {
image.onload = function() {
callback(image);
// clear onLoad, IE behaves erratically with animated gifs otherwise
image.onload=function(){};
}
image.onerror = function() {
alert("Could not load image.");
}
}
}
//调用
function AlertImageSize(image) {
alert("Image size: " + image.width + "x" + image.height);
}
LoadImage("http://example.org/image.png", AlertImageSize);
方法二,jquery的
var img = $("img")[0]; // Get my img elem
var pic_real_width, pic_real_height;
$("<img/>") // Make in memory copy of image to avoid css issues
.attr("src", $(img).attr("src"))
.load(function() {
pic_real_width = this.width; // Note: $(this).width() will not
pic_real_height = this.height; // work for in memory images.
});