var MyTest = document.getElementById("upload_img").files[0];
var reader = new FileReader();
reader.readAsDataURL(MyTest);
reader.onload = function(theFile) {
var image = new Image();
image.src = theFile.target.result;
image.onload = function() {
alert("图片的宽度为"+this.width+",长度为"+this.height);
};
};
其中,id为“upload_img”的标签如下:
<input type="file" size="20" autocomplete="off" id="upload_img" name="Uploadfile">