简单实现JS上传图片预览功能

<div class="upload">    <input type="button" class="btn" onclick="browerfile.click()" value="上传">    <input type="file" id="browerfile" style="display: none;" class="test">    <div class="img_center">      <img src="" class="img1-img">    </div>  </div>

//获取图片路劲的方法，兼容多种浏览器，通过createObjectURL实现function getObjectURL(file){  var url = null;  if(window.createObjectURL != undefined){    url = window.createObjectURL(file);//basic  }else if(window.URL != undefined){    url = window.URL.createObjectURL(file);  }else if(window.webkitURL != undefined){    url = window.webkitURL.createObjectURL(file);  }  return url;}//实现功能代码$(function(){  $("#browerfile").change(function(){    var path = browerfile.value;    var objUrl = getObjectURL(this.files[0]);    if(objUrl){      $('.img1-img').attr("src",objUrl);    }  })})