htmledit_views">

html" title=javascript>javascript">// 问题一
var count = 10;

function a() {
   return count + 10;
}

function b() {
   var count = 20;
   return a();
}

console.log(b()); //20

// 问题二
var a = [1, 2, 3, 4];
function set(a) {
    a = [5, 6, 7, 8];
}
set(a);
console.log(a); //[1,2,3,4]

var a = [1, 2, 3, 4];
function set(a) {
    //添加this，实现打印[5, 6, 7, 8]
    this.a = [5, 6, 7, 8];
}
set(a);
console.log(a); //[5, 6, 7, 8]