标签：++ 程序语言 alert speed 面试题 get 执行 tle 返回
<script>
function outFun() {
var num = 1;
function inFun() {
console.log(num);
}
}
</script>
<script>
function outFun() {
var num = 1;
function inFun() {
console.log(num);
}
return inFun;
}
var demo = outFun();
demo();
</script>
<script>
function outFun() {
var a = 0;
function inFun() {
a ++;
alert(a)
}
return inFun;
}
var obj = outFun();
obj();
obj();
var obj1 = outFun();
obj1();
obj1();
</script>
//1 2 1 2
闭包优点：不产生全局变量，实现属性私有化。
缺点：闭包的数据会常驻内存，在不用的时候要删掉，否则会导致内存溢出。
<script>
function Fun(x) {
return function (y) {
console.log(x+y);
}
}
var obj = Fun(2);
obj(3);
</script>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> div{ position: absolute; left: 0px; width: 200px; height: 200px; background-color: pink; } </style> </head> <body> <button id="btn2">左</button> <button id="btn1">右</button> <div id="box"></div> <script> var btn1 = document.getElementById("btn1"); var btn2 = document.getElementById("btn2"); var box = document.getElementById("box"); function move(speed) { return function () { box.style.left = box.offsetLeft + speed + "px"; } } btn1.onclick = move(5); btn2.onclick = move(-5); </script> </body> </html>
标签：++ 程序语言 alert speed 面试题 get 执行 tle 返回
原文地址：http://www.cnblogs.com/bky-1083/p/6363337.html
