字符串引号
重要性: 5
脚本的输出是什么？
let name = "Ilya";
alert( `hello ${1}` ); // ?
alert( `hello ${"name"}` ); // ?
alert( `hello ${name}` ); // ?反引号将表达式嵌入到 ${...} 中的字符串中。
let name = "Ilya";
// the expression is a number 1
alert( `hello ${1}` ); // hello 1
// the expression is a string "name"
alert( `hello ${"name"}` ); // hello name
// the expression is a variable, embed it
alert( `hello ${name}` ); // hello Ilya