上图:
- 声明
var myString = new String(“Every good boy does fine.”); var myString = “Every good boy does fine.”;
- 字符串连接
var myString = “Every ” + “good boy ” + “does fine.”; var myString = “Every “; myString += “good boy does fine.”;
- 截取字符串
//截取第 6 位开始的字符 var myString = “Every good boy does fine.”; var section = myString.substring(6); //结果: “good boy does fine.” //截取第 0 位开始至第 10 位为止的字符 var myString = “Every good boy does fine.”; var section = myString.substring(0,10); //结果: “Every good” //截取从第 11 位到倒数第 6 位为止的字符 var myString = “Every good boy does fine.”; var section = myString.slice(11,-6); //结果: “boy does” //从第 6 位开始截取长度为 4 的字符 var myString = “Every good boy does fine.”; var section = myString.substr(6,4); //结果: “good”
- 转换大小写
var myString = “Hello”; var lcString = myString.toLowerCase(); //结果: “hello” var ucString = myString.toUpperCase(); //结果: “HELLO”
- 字符串比较
var aString = “Hello!”; var bString = new String(“Hello!”); if( aString == “Hello!” ){ } //结果: true if( aString == bString ){ } //结果: true if( aString === bString ){ } //结果: false (两个对象不同,尽管它们的值相同)
- 检索字符串
var myString = “hello everybody.”; // 如果检索不到会返回-1,检索到的话返回在该串中的起始位置 if( myString.indexOf(“every”) > -1 ){ } //结果: true
- 查找替换字符串
var myString = “I is your father.”; var result = myString.replace(“is”,”am”); //结果: “I am your father.”
-
特殊字符
-
\b
: 后退符 -
\t
: 水平制表符 -
\n
: 换行符 -
\v
: 垂直制表符 -
\f
: 分页符 -
\r
: 回车符 -
\”
: 双引号 -
\’
: 单引号 \ 反斜杆
-
- 将字符转换成
Unicode
编码
var myString = “hello”; var code = myString.charCodeAt(3); //返回”l”的Unicode编码(整型) var char = String.fromCharCode(66); //返回Unicode为66的字符
- 将字符串转换成URL编码
var myString = “hello all”; var code = encodeURI(myString); //结果: “hello%20all” var str = decodeURI(code); //结果: “hello all” //相应的还有: encodeURIComponent() decodeURIComponent()
文/poetries(简书作者)
原文链接:http://www.jianshu.com/p/1f2314552e23
原文链接:http://www.jianshu.com/p/1f2314552e23