tdz

There are three situations in which the cursor participates in the Loop:(1) Declare cursor --> open cursor --> loop ---> fetch curosr into --> end loop --> close cursorIn this case, every time fetch is called, The cursor will be moved to the next record, but we need to construct a loop by ourselves.DeclareV_name TDZ. vxm% Type; -- % Type can be directly used to retrieve the field typeV_class TDZ. vbj% Type;

Recently studying ES6 in the ES6 series with Nanyi, some errors were found in the Let and Const commands chapter, which listsFirst, let does not exist the variable promotion assumes that there is no variable promotion, then in the Ruan Feng article this code code is correctfunction do_something () { console.log (foo);//Referenceerror let foo = 2;}The program will report referenceerror errors, while the actual execution is Undefinedg:\phpdemo\system\content\js>babel-node test.jsUndefined then w

declared using the Let command. Become "Temporary Dead Zone" (TDZ) syntactically if (true) { //TDZ starts tmp = ' abc ';//Referenceerror Console.log (TMP);//Referenceerror let tmp;//Tdz End C8/>console.log (TMP); Undefined tmp = 123; Console.log (TMP); 123 } If you use typeof before the Let declaration variable, you will also get an error. Do not declare withou

' [' User '], $config [' MSSQL '] [' password ']);mssql_select_db ($config [' MSSQL '] [' dbname '], $conn);$tm =$_request[' TM '];$sql = "exec hnow05_getttspace ', '". $tm. "', ' ', 1";$sql =mb_convert_encoding ($sql, ' GBK ', ' UTF-8 ');$res =mssql_query ($sql);$i = 0;$k = Array (' station code ', ' Station name ', ' river system ', ' to quote time ', ' water level ', ' Waters ');$count = count ($k);$arrs = Array (' A ', ' B ', ' C ', ' D ', ' E ', ' F ');Add a table headerfor ($i =0; $i $obj

"];$ Stnm = $ arr ["STNM"];$ Rvnm = $ arr ["RVNM"];$ Tm = $ arr ["TM"];$ Tdz = $ arr ["TDZ"];$ Tdptn = $ arr ["TDPTN"];If ($ tdptn = '6 '){$ Tdptn = 'ping ';} Else if ($ tdptn = '5 '){$ Tdptn = 'upgrade ';} Else if ($ tdptn = '4 '){$ Tdptn = 'drop ';} $ U1 = $ I + 2;$ Stnm = iconv ("GBK", "UTF-8", $ stnm );$ Rvnm = iconv ("GBK", "UTF-8", $ rvnm );$ Tm = iconv ("GBK", "UTF-8", $ tm ); /* ---------- Write con

)$ ObjExcel-> setActiveSheetIndex (0 );$ Conn = mssql_connect ($ config ['mssql'] ['host'], $ config ['mssql'] ['user'], $ config ['SQL'] ['Password']);Mssql_select_db ($ config ['mssql'] ['dbname'], $ conn );$ Tm = $ _ REQUEST ['TT'];$ SQL = "exec HNow05_getTTSpace'', '". $ tm."', '', 1 ";$ SQL = mb_convert_encoding ($ SQL, 'gbk', 'utf-8 ');$ Res = mssql_query ($ SQL );$ I = 0;$ K = array ('site Code', 'site name', 'river', 'reporting time', 'watermark', 'watermark ');$ Count = count ($ k );$ A

'] [' user '], $config [' MSSQL '] [' password ']); mssql_select_db ($config [' MSSQL '] [' dbname '], $conn); $tm =$_request[' TM ']; $sql = "exec hnow05_getttspace", ' ". $tm." ', ', 1 '; $sql =mb_convert_encoding ($sql, ' GBK ', ' UTF-8 '); $res =mssql_query ($sql); $i = 0; $k = Array (' station code ', ' Station name ', ' River stream ', ' to report time ', ' water level ', ' potential '); $count = count ($k); $arrs = Array (' A ', ' B ', ' C ', ' D ', ' E ', ' F '); Add Table Header for

. function func() { if (typeof val == 'undefined') { // ... } let val = '';} ES6 stipulates that, if the code block contains let, this block has formed a closed scope from the very beginning. If you use it before the declaration, an error is reported. That is, variables used before let Declaration are unavailable in the code block. The syntax is called temporal dead zone (TDZ. Of course, TDZ does no

= '';} ES6 stipulates that, if the code block contains let, this block has formed a closed scope from the very beginning. If you use it before the declaration, an error is reported. That is, variables used before let Declaration are unavailable in the code block. The syntax is called temporal dead zone (TDZ. Of course, TDZ does not appear in the ES specification. It is only used for image description. Let

once, when6# thefunctionis defined, and is stored as7# Just a property of thefunction8 print (foo.__defaults__) # ([],)9 TenFoo () # [1] OneFoo () # [1, 1] AFoo () # [1, 1, 1] - -# The reason for ThisAs we said: thePrint (foo.__defaults__) # ([1, 1, 1],)The workaround is to use the special constant none as the default value, and then judge and initialize the true default value within the function.1def foo (x =None):2 ifx is None:3x = []4X.append (1)5 print (x)6 7 print (foo.__defaults__)

function func () { if (typeof val = = ' undefined ') { //... } Let val = '; } ES6 stipulates that if there is a let in the code block, this block form a closed scope from the outset. Whenever you use it before a statement, you will get an error. In a code block, the use of variables before a let declaration is not available. There is a grammatical term called "temporary Dead Zone" (temporal dead Zone), referred to as TDZ. Of c

Subqueries can be used in cursors: (1) in the WHERE clause Delcare V_name Tdz.vxm%type; V_class Tdz.vbj%type; --------------------------------------------------------------------------------------------------------------- --------------- CURSOR MyCursor is Select Vxm.obj from Tdz where VBJ to (select Vbj from Tdjsz where vid= ' 1 '); ----------------------------------------------------------------------------------------------------------- ----------

let,if and report grammatical errors. 123456 function func () { NBSP;NBSP;NBSP;NBSP; if ( typeof val == ' undefined ' " { //... NBSP;NBSP;NBSP;NBSP; NBSP;NBSP;NBSP;NBSP; let val = " } ES6 rules that if let is present in a code block, the chunk forms a closed scope from the beginning. Any use before the declaration, will be an error. That is, within a code block, using a variable before a let declaration is not available. There is a grammatical term

is, within a code block, using a variable before a let declaration is not available. There is a grammatical term called "temporary Dead Zone" (temporal dead Zone), referred to as TDZ. Of course Tdz does not appear in the ES specification, it is only used to describe the image.Let's considerations1. Cannot repeat the declarationvar and let duplicate declaration var name = ' Jack '; let name = ' John ';//tw

. function func() { if (typeof val == 'undefined') { // ... } let val = '';} ES6 stipulates that, if the code block contains let, this block has formed a closed scope from the very beginning. If you use it before the declaration, an error is reported. That is, variables used before let declaration are unavailable in the code block. The syntax is called temporal dead zone (TDZ. Of course, TDZ does no

ITEMS = GetItems (); Let Dragonball; Const Gosportsteam = true; Let Len; Good Const Gosportsteam = true; Const ITEMS = GetItems (); Let Dragonball; let I; let length;9.4 Assign values to variables where you need them, but put them in a reasonable positionLet and const are block-level scopes rather than function scopes.10 Promotion10.1 var declarations are promoted to the top of the scope, but their assignments are not promoted.Let and const are given a concept called "temporary Dead Zo

console.log (b);//Error Referenceerror Console.log (c);//Error Referenceerror var a = 2; Let B = 2; Notice the difference between undefined and referenceerror. Temporary Dead Zone (TDZ)as long as you enter the current block-level scope, the variable you are using already exists, but before declaring it belongs to the dead zone and cannot be manipulated.Note: typeof is no longer a 100% safe operation typeof X; Referenceerror typeof y//u

Arangodb generating relationships through the collection of two documentFor M in meridiansFor P in acupointsFilter P.meridian = = M.displaynameInsert {_from:p._id, _to:m._id, property: "\"} in relations Import a CSV file exported from SQL database into Arangodb, one file per table #!/bin/sh # import CSV files data into Arangodb # which name is like: ' filename '. csv # noock Tian # 2 018-01-08 export csv_files= ' ls *.csv ' for F in $CSV _files do export ifs= ' \ '. ' Arr= (

write a function expression instead of a function declaration statement. There is no variable promotion The variable declared by the Let command must be used after the declaration, or an error will be made. The case of Var console.log (foo); Output Undefinedvar foo = 2;//Let case console.log (bar); Error Referenceerrorlet bar = 2; Temporary Dead Zone As long as a let command exists within a block-level scope, the variable it declares is "bound" to the area and is no longer affected by the exter

directories. You define each directory, including the concept in ANP, the package is packed in and can only be done in it without affecting the system. Host: This is about file access permissions. it is safer to set users to only access certain directories? Chen Xiaobing: Yes. Host: The types of some files may be very different from those of Windows and Linux. Can you briefly introduce the differences between the types of Windows files and those of Linux Files? Chen Xiaobing: in fact, the file