What does "object destructuring" mean and what is the result of a destructuring operation?Say you have an object with some properties:const person = { firstName: 'Tom', lastName: 'Cruise', actor: true, age: 57 }You can extract just some of the object properties and put them into ...
if(typeof(v1) == "string"){ //若为字符串, return v1.localeCompare(v2);//则用 localeCompare 比较汉字字符串, Firefox 与 IE 均支持 } return v1 > v2 ? 1 : (v1 < v2 ? -1 : 0); }; this.data.sort(s.direction, fn); if(this.snapshot && this.snapshot != this.data){ this...
A brief explanation to what hoisting means in the JavaScript programming languageJavaScript before executing your code parses it, and adds to its own memory every function and variable declarations it finds, and holds them in memory. This is called hoisting....
null and undefined are JavaScript primitive types.The meaning of undefined is to say that a variable has declared, but it has no value assigned.let age //age is undefinedlet age = null //age is nullNote: accessing a variable that’s not been declared will raise a ReferenceError: <...
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