之前自用的 javascript localStorage 封装

localdb.js

//给添加 get、set、keys、values、items、update 方法:
window.localStorage.__proto__.get = function(key, defaultvalue) {
    var txt = window.localStorage.getItem(key);
    if (txt == null) {
        return defaultvalue;
    }
    try{
        return JSON.parse(txt);
    } catch(e){
        return txt;
    }
}
window.localStorage.__proto__.set = function(key, obj) { 
    window.localStorage.setItem(key, JSON.stringify(obj));
}
window.localStorage.__proto__.keys = function() { return keys(window.localStorage) }
window.localStorage.__proto__.values = function() {
    var result = [];
    keys(window.localStorage).forEach( function(key) {
        result.push(window.localStorage.get(key));
    });
    return result;
}
window.localStorage.__proto__.items = function() {
    var result = [];
    keys(window.localStorage).forEach( function(key) {
        result.push([key, window.localStorage.get(key)]);
    });
    return result;
}
window.localStorage.__proto__.update = function(dict) {
    keys(dict).forEach( function(key) {
        window.localStorage.set(key, dict[key]);
    })
}