前端localStorage大小

//获取已用大小
var already_used_size=function(){
    var sizeStore = 0; if(window.localStorage) {  for(item in window.localStorage) { if(window.localStorage.hasOwnProperty(item)) { sizeStore += window.localStorage.getItem(item).length; } } } console.log((sizeStore / 1024 / 1024).toFixed(2) + 'M');
}

//获取最大大小
var get_max_size=function(){
    if(!window.localStorage) {
        console.log('当前浏览器不支持localStorage!')
    }    
    var test = '0123456789';
    var add = function(num) {
        num += num;
        if(num.length == 10240) {
            test = num;
            return;
        }
        add(num);
    }
    add(test);
    var sum = test;
    var show = setInterval(function(){
        sum += test;
        try {
            window.localStorage.removeItem('test');
            window.localStorage.setItem('test', sum);
            console.log(sum.length / 1024 + 'KB');
        } catch(e) {
            alert(sum.length / 1024 + 'KB超出最大限制');
            clearInterval(show);
        }
    }, 0.1)
}