变量，函数提升

var-fun-hoisting

//变量提升
var name = "Baggins";

(function () {
    // Outputs: "Original name was undefined"
    console.log("Original name was " + name);

    var name = "Underhill";

    // Outputs: "New name is Underhill"
    console.log("New name is " + name);
})();


//函数提升
// Outputs: "Definition hoisted!"
definitionHoisted();

// TypeError: undefined is not a function
definitionNotHoisted();

function definitionHoisted() {
    console.log("Definition hoisted!");
}

var definitionNotHoisted = function () {
    console.log("Definition not hoisted!");
};


// ReferenceError: funcName is not defined
funcName();

// TypeError: undefined is not a function
varName();

var varName = function funcName() {
    console.log("Definition not hoisted!");
};