作者介绍：友友们好我是乱披风锤，大二学生党一枚
JavaSrcipt学习（学习打卡Day9）
5.7 分割字符串.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
var str="HTML,CSS,JavaScript";
var arr=str.split(",");
document.write("数组第一个元素是"+arr[0]+"<br>")
document.write("数组第二个元素是"+arr[1]+"<br>")
document.write("数组第3个元素是"+arr[2])
</script>
</head>
<body>
</body>
</html>
5.8 检索字符串的位置.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
var str="hello lvye!";
document.write(str.indexOf("lvye")+"<br>")
document.write(str.indexOf("lvyer"))
document.write("e最后出现的下标是：" + str.lastIndexOf("e"));
</script>
</head>
<body>
</body>
</html>
5.9 实战题：统计某一个字符的个数.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
var str="Can you can a can as a Canner can can a can"
var n=0;
for (var i=0;i<str.length;i++){
var char=str.charAt(i);
if(char.toLowerCase()=="c"){
n+=1;
}
}
document.write("字符串中含有"+n+"个字母c");
</script>
</head>
<body>
</body>
</html>
5.10 实战题：统计字符串中有多少个数字？.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function getNum(str)
{
var num=0;
for (var i=0;i<str.length;i++)
{
var char=str.charAt(i);
if(char!=" "&& !isNaN(char)){
num++;
}
}
return num;
}
document.write(getNum("1d3sdsg"))
</script>
</head>
<body>
</body>
</html>
6.3 数组的获取.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
var arr=["中国","广东","广州","天河","港大"];
document.write(arr[3]);
</script>
</head>
<body>
</body>
</html>
6.4 数组的赋值.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
var arr=["HTML","CSS","JavaScript"];
arr[2]="jQuery";
document.write(arr[2])
</script>
</head>
<body>
</body>
</html>
总结
那么今天的学习就到这里了。友友们觉得不错的可以给个关注，点赞或者收藏哦！感谢各位友友们的支持。以下的代码希望各位大佬们自行检验哦，毕竟亲手操作让记忆更加深刻。
