比较sessionStorage值时无法调用Javascript函数

我目前正在创建一个flash库,每次按下新按钮以查看新flash时,我都希望看到页面重新加载以显示新广告。我已经解决了控制台的问题。日志并已确定sessionStorage变量设置正确,但当调用back/rand/next()函数时,它会停止运行。任何小费都很有价值。

(编辑)进入控制台。log('收到随机按钮!');

代码

 var flashcon, test, temp;
    var back, rand, next;

    back = document.getElementById('back');
    rand = document.getElementById('rand');
    next = document.getElementById('next');
    flashcon = document.getElementById('flashcon');

    function init() {
        if (sessionStorage.getItem('ref') == 1) {
            console.log('Back button ses received!');
            back();
        } else if (sessionStorage.getItem('ref') == 2) {
            console.log('Rand button ses received!');
            rand();
        } else if (sessionStorage.getItem('ref') == 3) {
            console.log('Next button ses received!');
            next();
        } else {
            console.log('First time or a reset');
        }

        // Scripts for the buttons
        back.onclick = function () {
            console.log('Back button pressed');
            sessionStorage.setItem('ref', 1);
            location.reload();
        };
        rand.onclick = function () {
            console.log('Rand button pressed');
            sessionStorage.setItem('ref', 2);
            location.reload();
        };
        next.onclick = function () {
            console.log('Next button pressed');
            sessionStorage.setItem('ref', 3);
            location.reload();
        };
    }

    // What switches the flashs
    function back() {
        console.log('Back function');
        sessionStorage.clear();
        if (c == 0) {
            c = paths.length;
        }
        c--;
        displayFiles();
        download();
    }

    function rand() {
        console.log('Rand function');
        sessionStorage.clear();
        if (c == paths.length - 1) {
            c = -1;
        }
        c++;
        displayFiles();
        download();
    }

    function next() {
        console.log('Next function');
        sessionStorage.clear();
        temp = c;
        while (c == temp) {
            c = Math.floor(Math.random() * paths.length);
        }
        displayFiles();
        download();
    }