JS 把 Wed Jul 15 2015 00:00:00 GMT+0800 转换成2015-07-15

function strlen(str) {

            var len = 0;

            for (var i = 0; i < str.length; i++) {

                var c = str.charCodeAt(i);

                //单字节加1 

                if ((c >= 0x0001 && c <= 0x007e) || (0xff60 <= c && c <= 0xff9f)) {

                    len++;

                }

                else {

                    len += 2;

                }

            }

            return len;

        }

        function Todate(num) { //Fri Oct 31 18:00:00 UTC+0800 2008     Wed Jul 15 2015 00:00:00 GMT+0800

            num = num + "";

            var date = "";

            var month = new Array();

            month["Jan"] = 1; month["Feb"] = 2; month["Mar"] = 3; month["Apr"] = 4; month["May"] = 5; month["Jan"] = 6;

            month["Jul"] = 7; month["Aug"] = 8; month["Sep"] = 9; month["Oct"] = 10; month["Nov"] = 11; month["Dec"] = 12;

            var week = new Array();

            week["Mon"] = "一"; week["Tue"] = "二"; week["Wed"] = "三"; week["Thu"] = "四"; week["Fri"] = "五"; week["Sat"] = "六"; week["Sun"] = "日";

            

            str = num.split(" ");

            date = str[3] + "-";

            var count = strlen(month[str[1]]);

            var m = month[str[1]];

            if (count = 1) {

                m = "0" + month[str[1]];

            }

            date = date + m + "-" + str[2];

            return date;

        }

方法Todate(参数)  参数格式：Wed Jul 15 2015 00:00:00 GMT+0800