js 格式化 Date 对象，输出格式为 yyyy-MM-dd HH:mm:ss 字符串

// js 格式化 date 对象，输出格式为 yyyy-MM-dd HH:mm:ss 字符串
function jsDateFormatter( dateInput ) {  // dateInput 是一个 js 的 Date 对象
        var year = dateInput.getFullYear();
        var month = dateInput.getMonth() + 1;
        var theDate = dateInput.getDate();

        var hour = dateInput.getHours();
        var minute = dateInput.getMinutes();
        var second = dateInput.getSeconds();

        if ( month < 10 ) {
            month = '0' + month;
        }

        if ( theDate < 10 ) {
            theDate = '0' + theDate;
        }

        if ( hour < 10 ) {
            hour = '0' + hour;
        }

        if ( minute < 10 ) {
            minute = '0' + minute;
        }

        if ( second < 10 ) {
            second = '0' + second;
        }

        return year +"-"+ month +"-" + theDate + " "+ hour +":"+ minute +":"+ second;
}

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调用这个函数：  var strDate = jsDateFormatter( new Date() );