String object in JavaScript

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript string对象</title>
</head>
<body>

<script>
var name = new String('devZhang');
var job = "devZhang is an iOS developer !";
document.write("Two ways to create string objects: <br> 1, " + name + "<br> 2, " + job + "<br>");	

var nameLength = name.length
document.write("<br>The length of the string " + name + " is: " + nameLength + "<br>");

var indexChar = name.indexOf ('Z')
document.write("<br> The position of the character 'Z' in the string " + name + ": " + indexChar + "<br>");
	
var charIndex = name.charAt (1)
document.write("<br>string" + name + "The character at position 1 is: " + charIndex + "<br>");
	
var namejob = name.concat(" is an ").concat(job)
document.write("<br>字符串拼接：" + namejob + "<br>")

var nameUpper = name.toUpperCase()
document.write("<br>The string is converted to uppercase: " + nameUpper + "<br>")

var nameLower = name.toLowerCase()
document.write("<br>The string is converted to lowercase: " + nameLower + "<br>")

var jobTrim = job.trim ()
document.write("<br>Remove spaces on both sides of the string: " + jobTrim + "<br>")

var jobReplace = job.replace("developer", "Developer")
document.write("<br>字符串替换：" + jobReplace + "<br>")

var jobSearch = job.search("eve")
document.write("<br>string search substring position: " + jobSearch + "<br>")

var jobSlice = job.slice (3.7)
document.write("<br>Get the substring at the specified start and end position in the string: " + jobSlice + "<br>")

var jobSplit = job.split(" ")
document.write("<br>The substring is split according to the specified format string: " + jobSplit + "<br>")
	
var jobSub = job.substr(1,3)
document.write("<br>Get the substring of the specified position and length in the string: " + jobSub + "<br>")

</script>

</body>
</html>

There are two ways to create string objects:
1、devZhang
2、devZhang is an iOS developer !

The length of the string devZhang is: 8

Position of character 'Z' in string devZhang: 3

The character at position 1 in the string devZhang is: e

String concatenation: devZhang is an devZhang is an iOS developer !

Convert string to uppercase: DEVZHANG

Convert string to lowercase: devzhang

Remove the spaces on both sides of the string: devZhang is an iOS developer !

String replacement: devZhang is an iOS Developer !

String lookup substring position: 20

Get the substring at the specified start and end position in a string: Zhan

The substring is split according to the specified format string: devZhang,is,an,iOS,developer,!

Get a substring at a specified position and length in a string: evZ

String object in JavaScript

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