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1. Two new methods
(1) startWith: determine a string Whether it starts with a certain field
let str='asdfgh'; console.log(str.startsWith('a'));//true
Application:
let str='http://it.kaikeba.com'; if(str.startsWith('http://')){ console.log("普通网址") }else if(str.startsWith('https://')){ console.log("加密网址") }else if(str.startsWith('git://')){ console.log("git网址") }else if(str.startsWith('svn://')){ console.log("svn网址") }else{ console.log("其他网址") }
(2) endsWith: Determine whether a string Ending with a certain field
Similarly:
let str='asdfg.txt';if(str.endsWith('.txt')){ console.log("文本文件") }else if(str.endsWith('.png')){ console.log("png图片") }else if(str.endsWith('.jpg')){ console.log("jpg图片") }else{ console.log("其他文件") }
2. String template, string connection
(1) Directly stuff things into the string
let str1='asdfgh';//第一种字符串方式let str2='asdfgh';//第二种字符串方式let str3=`asdfgh`;//第三种:反单引号/应用: let a=12; let str4=`a${a}bc`; console.log(str4);//a12bc
(2) You can wrap lines
let title='标题'; let content='内容'; let str1='<div>\ <h1>'+title+'</h1>\ <p>'+content+'</p>\ </div>'; let str2=` <div> <h1>${title}</h1> <p>${content}</p> </div> `;
Recommended learning: JavaScript video tutorial
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