Template Literals(模版)

如果需要拼接一个字符串,一般的做法

var name = 'Your name is ' + first + ' ' + last + '.';
var url = 'qq.com/' + id; 

在ES6中,可以使用语法${NAME},并把它放在反引号里

var name = `Your name is ${first} ${last} .`;
var url = `qq.com/${id}`;

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