localStorage实现便签小程序

function isUser()
{
  var storage = window.localStorage;
  if (storage.user != undefined)
  {
    document.getElementById("showmess").style.display = "block";
    document.getElementById("fillmess").style.display = "none";
  }
  else
  {
    document.getElementById("showmess").style.display = "none";
    document.getElementById("fillmess").style.display = "block";
  }  
}

var pic; //全局变量存储图片信息
/*从本地电脑获得图片*/
 function add_files(files) {
        if (files.length) {
          var file = files[0];
          var reader = new FileReader();
          reader.Onload= function(e) {
            document.getElementById("userpic").src = e.target.result;
            pic = e.target.result;
          }
          reader.readAsDataURL(file);
        }
      }
function saveUserMess()
{
  var name = document.getElementById("username").value;
  if (name != "")
  {
    var storage = window.localStorage;
    var jsOnObj= {
                name:name,
                icon:pic
              }; 
      var user = JSON.stringify(jsonObj);
      storage.setItem("user",user);
  }
  else
  {
    alert("昵称不为空"); 
  }
}

function save_diary()
{
 var headle = document.getElementById("headle").value;
 var cOnt= document.getElementById("diary").value;
 if (headle != "" && cont != "")
 {
  var storage = window.localStorage;
  if (storage.diary != undefined)
  {
   var diary = storage.getItem("diary");
   var jsOnObj= JSON.parse(diary);
   var diaryItem = {
        headle:headle,
        diary:cont,
        date:new Date()
       }; 
   jsonObj.push(diaryItem);
   var data = JSON.stringify(jsonObj);
   storage.setItem("diary",data); 
  }

  else
  {
   var jsOnObj= [{
        headle:headle,
        diary:cont,
        date:new Date()
       }]; 
   var diary = JSON.stringify(jsonObj);
   storage.setItem("diary",diary);
  }
 }
 else
 {
  alert("标题和内容不为空哦"); 
 }
}

function showDiary()
{
  var storage = window.localStorage;
  var mess = JSON.parse(storage.user);
  if (storage.diary != undefined)
  {
    var json = JSON.parse(storage.diary);
    var div_id = document.getElementById("diarymess");
    for (var i = 0; i 

'+mess.name+'
'+json[i].headle+'
'+json[i].date+'
'+'
'+json[i].diary+'
'; 
    }

  }
}