---恢复内容开始---
1.
var a = 12 function fn（） { console.log(a) var a = 45; console.log(a) } fn() 2. function fn() { console.log(11) function ff() { console.log(22) } ff() } fn() 3. function fn() { console.log(5)
fn() } fn() 4. var a = 123;
function fun() { alert(a); } fun(); 5. var a = 123;
function fun() { alert(a); var a = 456; } fun(); alert(a); 6. var a = 123;
function fun(a) { alert(a); a = 456; } fun(); alert(a); 7. var a = 123;
function fun(a) { alert(a); a = 456; } fun(123); alert(a); 8. function test(a, b) { console.log(a); console.log(b); var b = 234; console.log(b); a = 123; console.log(a);
function a() {} var a; b = 234; var b = function() {} console.log(a); console.log(b); } test(1); 9. function fn(a) { console.log(a); var a = 123; console.log(a);
function a() {} console.log(a); var b = function() {} console.log(b);
function d() {} } fn(1); 10.function fn() {
console.log(12) } var as = fn()
console.log(as)
11. function fn() { console.log(12)
return 45; console.log(456) }
fn() 12. var a = 12; function fn() { console.log(a)
return 4; var a = 45; }
fn() 13. var a = 100; function testResult() { var b = 2 * a var a = 200 var c = a / 2
alert(b)
alert(c) } testResult()
以上为作用域问题，如有不会请加qq：2521387292
---恢复内容结束---
转载于:https://www.cnblogs.com/guhuai/p/10066263.html
