SOURCE

var loverName = 'zy';
console.log(loverName);
var sex = 1,age=19;
console.log(sex, age);
var school=room='FZU';
console.log(school,room)

console.log(typeof school)
school = [1,2,3]
console.log(typeof school)
school = {name:'zy'}
console.log(typeof school)

/***
 * 
 * 变量提升：JS代码在执行之前，会把var声明的变量提升到各自作用域的最顶部
 * 函数提升：JS代码在执行之前，会把function声明的函数提升到各自作用域的最顶部
 * 
 */
function loverZy(){
    if(false){
        var name = 'zy'
    }
    console.log(name)
}
loverZy()