[ES6] template string: `string`, a new symbol in es2015

explain ： Through an example to illustrate the differences between the three ：
Be careful ： Symbol of template string [`] It's a button ~ The symbol under
describe ：
There is one js Variables store the total number of people ：var peopleSum = 88,
It is required to output this sentence in the following format ： The total number of people is 88 people

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 Mode one ： Single quotation marks 

      

       
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console.log(‘ The total number of people is ’+peopleSum+‘ people ’);

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 Mode two ： Double quotes 

      

       
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console.log(“ The total number of people is ”+peopleSum+“ people ”);

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 Mode three ： Template string 

      

       
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console.log( The total number of people is ${peopleSum} people );

explain ：string It's a template string ,ES2015 New symbols . In the template string var Is a placeholder for variables .
{} inside The expression is still js, Outside, too js .