var string = `aaa
bbb
ccc`;

var string = "aaa";
var getString = function(){
　　return "aaa";
}
console.log(`hello ${string}`);　　// "hello aaa"
console.log(`hello ${getString()}`);　　// "hello aaa"

function hello (template, name, age) {
　　console.log(template);
　　console.log(name);
　　console.log(age);
}
var myName = "张三";
var getAge = function () {
　　return 18;
}
hello`Hello, my name's ${myName}, i'm ${getAge()}`;