data-types.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 12 行

// initialize a number variable
var a = 0.06;

// initialize a string variable
var b = "JavaScript in easy steps";

// initialize a boolean variable
var c = false;
  
// display the data types of each variable
alert( typeof a + "\n" + typeof b + "\n" + typeof c );