检索本地存储时如何获取键值

Question

I am using HTML5 and local storage to set / retrieve key/value pairs.

To set the value:

localStorage.setItem("003o000000BTRXz", "MyValue");

Then I utilized a function to loop through all stored items

for(var i = 0; i < localStorage.length; i++) {
  var obj = localStorage.getItem(localStorage.key(i));
  alert(obj);
}

The result is "MyValue" and I would like it to be "003o000000BTRXz".

What would be the proper syntax to get this?

Answer 1

Use localStorage.key(i) to get the key:

for (var i = 0; i < localStorage.length; i++) {
    var key   = localStorage.key(i);
    var value = localStorage.getItem(key);

    alert(key + ": " + value);
}

Answer 2

All browsers, especially the old ones might sometimes not support localstorage api included in HTML5. Thus it is advisable to first check if your browser supports it like so,

if(typeof(Storage) !== "undefined") {
// Have fun with localstorage! :)
} else {
// alert something saying doesn't support
}

Use the localstorage api like so,

// Store
localStorage.setItem("key", "Value");
// Retrieve
localStorage.getItem("key");