function ChangeDateFormat(val) {
    if (val != null) {
        var date = new Date(parseInt(val.replace("/Date(", "").replace(")/", ""), 10));
        //月份为0-11，所以+1，月份小于10时补个0
        var month = date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1;
        var currentDate = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();
        return date.getFullYear() + "-" + month + "-" + currentDate;
    }
    return "";
}

var str = ‘/Date(1333245600000+0800)/‘;
 
function data_string(str) {
    var d = eval(‘new ‘ + str.substr(1, str.length - 2));
    var ar_date = [d.getFullYear(), d.getMonth() + 1, d.getDate()];
    for (var i = 0; i < ar_date.length; i ++) ar_date[i] = dFormat(ar_date[i]);
    return ar_date.join(‘-‘);
     
    function dFormat(i) { return i < 10 ? "0" + i.toString() : i; }
}

alert(data_string(str));