node class add http module

class-http/async.js

@@ -0,0 +1,39 @@
+var c = 0
+
+function printIt() {
+ console.log(c)
+}
+
+// step 1:
+// 同步执行
+/*
+function plus() {
+ c += 1
+}
+*/
+
+// step 2:
+// 同步执行收到干扰
+/*
+function plus() {
+ setTimeout(function(){
+ c += 1; 
+ },1000);
+}
+*/
+
+// step 3:
+// Callback 方式实现同步执行 => 异步编程实现非堵塞
+function plus(callback) {
+ setTimeout(function() {
+ c += 1;
+ callback();
+ },1000);
+}
+
+// step 1 & 2 : 
+//plus()
+//printIt()
+
+// step 3:
+plus(printIt)

class-http/callback.js

@@ -0,0 +1,15 @@
+function learn(something) {
+ console.log(something)
+}
+
+function we(callback, something) {
+ something += ' is so cool'
+ callback(something)
+}
+
+we(learn, 'Node')
+
+// 匿名函数
+we(function(something){
+ console.log('The second : ' + something)
+}, 'Jade')

class-http/event.js

@@ -0,0 +1,7 @@
+function clickIt() {
+ window.alert('Button is clicked')
+}
+
+var button = document.getElementById('#button')
+
+button.addEventListener('click', clickIt)