js上传图片回显

 $("#file01").change(function(){
            var objUrl = getObjectURL(this.files[0]) ;
            console.log("objUrl = "+objUrl) ;
            if (objUrl) 
            {
              $("#img01").attr("src", objUrl);
    
            }
          }) ;
//建立一個可存取到該file的url
          function getObjectURL(file) 
          {
            var url = null ;
            if (window.createObjectURL!=undefined) 
            { // basic
              url = window.createObjectURL(file) ;
            }
            else if (window.URL!=undefined) 
            {
              // mozilla(firefox)
              url = window.URL.createObjectURL(file) ;
            } 
            else if (window.webkitURL!=undefined) {
              // webkit or chrome
              url = window.webkitURL.createObjectURL(file) ;
            }
            return url ;
          }