//目前只有chrome支持websql,其它浏览器都不支持websql
  let storage = new BrowserStorage();

  //indexdb
  let indexdb = new BrowserStorage('indexdb');

  //localStorage
  let local = new BrowserStorage('local');

  //sessionStorage
  let session = new BrowserStorage('session');

  //内存
  let memory = new BrowserStorage('memory');

  //websql
  let websql = new BrowserStorage('websql');

  //添加数据
  for(var i =0 ; i < 10 ; i++ ){
    storage.put("storage_"+i,"testcase " + i)
  }
  
  //获取数据
  storage.get("storage_0").then(function(res){
    console.log(res);
  })
  
  //删除数据
  storage.del("storage_9").then(function(res){
    console.log(res);
  })
  
  //存储大小
  storage.size().then(function(res){
    console.log(res);
  })
  
  //获取包含关键字key
  storage.keys("storage").then(function(res){
    console.log(res);
  })