<html><head><title>基本语法</title></head><body><script>// window.alert("js");// document.write("js");// console.log("js");// function add(a,b){// return a+b;// }var result = function(a,b){return a + b;}// var result = add(11,10);// alert(result);</script></body>
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var arr = [1,2,3,4];arr[6] = "java";console.log(arr);for (let i = 0; i < arr.length; i++) {console.log(arr[i]); }arr.forEach(e => {console.log(e);});arr.push(12,"web");arr.splice(3,4);console.log(arr);
var str = " hello world ";console.log(str.length);console.log(str.charAt(5));console.log(str.indexOf("o"));var s = str.trim();document.write(s);console.log(str.substring(0,4));
var user = {name : "jiabao",age : 23,gender : "male",eat(){alert("chifan");}}alert(user.name);user.eat(); var user = {name : "jiabao",age : 23,gender : "male",eat(){alert("chifan");}}alert(user.name);user.eat();
var user = {name : "jiabao",age : 23,gender : "male",eat(){alert("chifan");}}// alert(user.name);// user.eat();var json = '{"name":"老王","age":18,"gener":["nan","nv"]}';var jsonobject = JSON.parse(json);alert(jsonobject.name);var json = JSON.stringify(jsonobject); 
alert("吃饭了吗");var i = 0;setInterval(function(){i++;document.write("吃了" + i + "次");},2000)setTimeout(function(){document.write("吐了出来")},1000)confirm("您确定不吃？");
alert(location.href);
location.href = "https://www.itcast.cn"
var picture = document.getElementsByName('picture')for (let i = 0; i < picture.length; i++) {var p = picture[i];p.src="../img/huawei.jpg";}var h = document.getElementsByTagName('div');for (let i = 0; i < h.length; i++) {const element = h[i];element.innerHTML+= "<font color = 'red'>666</font>";}var name = document.getElementsByName('hobby');for (let i = 0; i < name.length; i++) {const element = name[i];element.checked=true;} 
<html><head><title>点击练习</title></head><body><img id="p1" src="../img/alibaba.jpg"><br><br><input type="button" id="up" value="点亮"><input type="button" id="blow" value="熄灭"><br><br><input type="text" name = "point" value = "itcaAS"><br><br><input type="checkbox" name="movie">电影<input type="checkbox" name="movie">旅游<input type="checkbox" name="movie">游戏<br><br><input type="button" id="allup" value="全选"><input type="button" id="allcontrary" value="反选"></body><script>document.getElementById('up').onclick=function(){var picture = document.getElementById('p1');picture.src = "../img/alibaba.jpg";alert("切换成功");} document.getElementById('blow').onclick=function(){var picture = document.getElementById('p1');picture.src = "../img/huawei.jpg";alert("切换成功");}document.getElementsByName('point')[0].onfocus=function(){var big = document.getElementsByName('point')[0];big.value = big.value.toUpperCase();} document.getElementsByName('point')[0].onblur=function(){const low = document.getElementsByName('point')[0];low.value = low.value.toLowerCase();}document.getElementById("allup").onclick=function(){const check = document.getElementsByName('movie');for (let i = 0; i < check.length; i++) {const element = check[i];element.checked=true;}}document.getElementById("allcontrary").onclick=function(){const check = document.getElementsByName('movie');for (let i = 0; i < check.length; i++) {const element = check[i];element.checked=false;}}</script>
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