es6 模板字符串

模板字符中，支持字符串插值：

let first = 'hubwiz';
let last = '汇智网';
document.write(`Hello ${first} ${last}!`);
// Hello hubwiz 汇智网!

模板字符串可以包含多行：

let multiLine = `
    This is
    a string
    with multiple
    lines`;
    document.write(multiLine);