JavaScript - First step - Strings

本文主要是介绍JavaScript - First step - Strings，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

var string = 'The revolution will not be televised.';
var string = "The revolution will not be televised.";

转义字符

var bigmouth = 'I\'ve got no right to take my place...';
bigmouth;

字符串连接

var one = 'Hello, ';
var two = 'how are you?';
var joined = one + two;
joined;

<button>Press me</button>

var button = document.querySelector('button');button.onclick = function() {var name = prompt('What is your name?');alert('Hello ' + name + ', nice to see you!');
}

Numbers vs. strings

'Front ' + 242;
// 结果是字符串 "Front 242"var myDate = '19' + '67';
typeof myDate;
// "string"

类型转换

var myString = '123';
var myNum = Number(myString);
typeof myNum;
// "number"var myNum = 123;
var myString = myNum.toString();
typeof myString;
// "string"

String 方法

取得字符串长度

var browserType = 'mozilla';
browserType.length;
// 7

取得字符串中的指定字符

browserType[0];
// "m"browserType[browserType.length-1];
// "a"

搜寻字符串中的子串

browserType.indexOf('zilla');
// 2
// 若存在，返回子串的起始索引browserType.indexOf('vanilla');
// -1
// 若不存在，返回 -1

依据起迄索引，取得子串

browserType.slice(0,3);
// "moz"
// 索引0至索引3的字符browserType.slice(2);
// "zilla"
// 索引2至字符串结尾的字符

大小写转换

var radData = 'My NaMe Is MuD';
radData.toLowerCase();
// "my name is mud"var radData = 'My NaMe Is MuD';
radData.toUpperCase();
// "MY NAME IS MUD"

更新字符串中，部分字符

browserType.replace('moz','van');
// "vanilla"

 

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