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Correction status：qualified
Teacher's comments：基本语法并不多, 与php差不多
Collection
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script>
/*
function func() {
var a = 123;
alert(a);
return 'abc';
}
alert(func());
*/
/*
var score = 90;
if (score < 60) {
alert('不及格');
}
if (score >= 60 && score < 80) {
alert('良好');
}
if (score >= 80 && score < 90) {
alert('不错哦');
}
if (score >= 90 && score < 100) {
alert('优秀');
}
*/
/*
var num = 6;
for (i = 0; i < num; i++) {
alert('i=' + i);
}
var num = 1;
while (num < 6) {
alert('num=' + num);
num++;
}
var num = 6;
while (num > 6) {
alert('num=' + num);
}
*/
/*
var num = 'asd';
num = parseInt(num);
//parseInt 转换为整型
alert(typeof(num));
if (isNaN(num)) {
alert('转换失败');
}
if (isNumber(num)) {
alert(num);
}
*/
/*
var arr = [1, 2, 3, 5, 6];
//不建议插入数据
//arr[9] = 44;
//往数组后面插入数据
arr.push(44);
alert('长度是' + arr.length);
//弹出尾部元素
var res = arr.pop();
alert(res);
console.log(arr);
alert('长度是' + arr.length);
*/
//var arr = [1, 2, 3, 5, 6];
//在第一个位置添加一个元素
//arr.unshift('abc');
//删除第一个元素
//var res = arr.shift();
//alert(res);
//console.log(arr);
var arr = [1, 2, 3, 4, 5, 6];
//从第几个元素开始删除几个元素
//var res = arr.splice(2, 4);
//console.log(res);
//搜索目标元素，第几个元素开始找；返回改数据索引
//var res = arr.indexOf(5, 0);
//alert(res);
//console.log(arr);
//数组遍历
// for (i = 0; i < arr.length; i++) {
// console.log(arr[i]);
// }
// var i = 0;
// while (i < arr.length) {
// console.log(arr[i]);
// i++;
// }
function over() {
console.log('鼠标滑过了');
}
function out() {
console.log('鼠标划走了');
}
</script>
</head>
<body>
<div style="background-color: aqua; width: 200px; height: 80px;" onmouseover="over()" onmouseout="out()"></div>
</body>
</html>