Daily Archives: October 10, 2018

雖然let引入block scope，避免了var的variable hoisting，但是須注意 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let let bindings are created at the top of the (block) scope containing the declaration, commonly referred to as “hoisting”. Unlike variables declared with var, which will start with the value undefined, let variables are not initialized … Continue reading →