input file直接获取路径

function check(){
var img = document.createElement('img');
var file = document.getElementById('upload').files[0];
// .getAsDataURL();
if (window.FileReader) {
var reader = new FileReader();
reader.readAsDataURL(file);
//监听文件读取结束后事件
reader.onloadend = function (e) {
img.src = e.target.result;
}
var contain = document.getElementById("imgcontainer");
contain.appendChild(img);
//console.log(this.files.item(0).getAsDataURL());
}
}