functionbigFunction(){// code... myVariable; // => Throws 'ReferenceError: myVariable is not defined' // code... let myVariable = 'Initial value'; // code... myVariable; // => 'Initial value'}bigFunction(); Tip
functionbigFunction() {// code...myvariable; // => undefined// code...var myVariable ='Initial value';// code...myVariable; // =>'Initial value'}bigFunction(); 1. 2. 3. 4. 5. 6. 7. 8. 9. 相反,在声明行之前不能访问let(包括const)变量。发生这种情况是因为该变量在声明之前处于...
functionbigFunction() {// code...myVariable;// => undefined// code...varmyVariable ='Initial value';// code...myVariable;// => 'Initial value'}bigFunction(); 即使在变量被声明和赋值之前,myVariable变量也是可获取的,值是undefined。 相反的,用let 或者const声明的变量在声明前是不可访问的。...
function bigFunction() {// code...myVariable; // => Throws 'ReferenceError: myVariable is not defined'// code...let myVariable = 'Initial value';// code...myVariable; // => 'Initial value'}bigFunction(); Tip 2: 增强内聚性 [Cohesion]...
const的一个很好的特性是 - 你必须给初始值赋予变量const myvariable ='initial'。变量不会暴露于未初始化的状态,并且访问undefined根本不可能。 让我们检查一下验证单词是否是回文的函数: functionisPalindrome(word){ const length = word.length; const half = Math.floor(length /2);for(let index =0; inde...
const的一个很好的特性是 - 你必须给初始值赋予变量const myvariable ='initial'。变量不会暴露于未初始化的状态,并且访问undefined根本不可能。 让我们检查一下验证单词是否是回文的函数: function isPalindrome(word) { const length = word.length;
# function — a catch-22. if is-at-least 5.9 && _zsh_highlight__function_callable_p add-zle-hook-widget then autoload -U add-zle-hook-widget _zsh_highlight__zle-line-finish() { # Reset $WIDGET since the 'main' highlighter depends on it. # # Since $WIDGET is declared by...
/** * @param {Node} node * @param {State} state * @returns {Chunk[]} */ function handle(node, state) { const handler = handlers[node.type]; if (!handler) { throw new Error(`Not implemented ${node.type}`); } const result = handler(node, state); if (node.leadingComments) {...
EXPAND_AS_DEFINED = # If the SKIP_FUNCTION_MACROS tag is set to YES then doxygen's preprocessor will # remove all references to function-like macros that are alone on a line, have # an all uppercase name, and do not end with a semicolon. Such function macros # are typically used ...
Reading stops if a NUL is encountered in the * input, so it is safe to pass this function an arbitrary * null-terminated string. */ extern int get_sha1_hex(const char *hex, unsigned char *sha1); extern int get_oid_hex(const char *hex, struct object_id *sha1); /* * Convert ...