标签：syntax tps pre local you protocol str nta tin
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The?sessionStorage?property allows you to access a session?Storage?object for the current origin. sessionStorage is similar to?Window.localStorage, the only difference is while data stored in localStorage has no expiration set, data stored in sessionStorage gets cleared when the page session ends. A page session lasts for as long as the browser is open and survives over page reloads and restores.?Opening a page in a new tab or window will cause a new session to be initiated,?which differs from how session cookies work.
It should be noted that data stored in either sessionStorage or localStorage?is specific to the protocol of the page.
// Save data to sessionStorage
sessionStorage.setItem(‘key‘,
‘value‘);
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// Get saved data from sessionStorage
var data = sessionStorage.getItem(‘key‘);
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// Remove saved data from sessionStorage
sessionStorage.removeItem(‘key‘);
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// Remove all saved data from sessionStorage
sessionStorage.clear();
The following snippet accesses the current domain‘s session?Storage?object and adds a data item to it using?Storage.setItem().
sessionStorage.setItem(‘myCat‘,
‘Tom‘);
The following example autosaves the contents of a text field, and if the browser is accidentally refreshed, restores the text field content so that no writing is lost.
// Get the text field that we‘re going to track
var field = document.getElementById("field");
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// See if we have an autosave value
// (this will only happen if the page is accidentally refreshed)
if
(sessionStorage.getItem("autosave"))
{
// Restore the contents of the text field
field.value = sessionStorage.getItem("autosave");
}
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// Listen for changes in the text field
field.addEventListener("change",
function()
{
// And save the results into the session storage object
sessionStorage.setItem("autosave", field.value);
});
Note: Please refer to the?Using the Web Storage API?article for a full example.
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From: https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage
标签：syntax tps pre local you protocol str nta tin
原文地址：http://www.cnblogs.com/time-is-life/p/7693568.html
