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ES6的Template Literals。

 const result = {

  success: ["max-length""no-amd""prefer-arrow-functions"],
  failure: ["no-var""var-on-top""linebreak"],
  skipped: ["no-extra-semi""no-dup-keys"]
};
function makeList(arr) {
  // Only change code below this line
  const failureItems = [];
  for (let i=0;i<arr.length;i++)
  {
    failureItems.push(`<li class="text-warning">${arr[i]}</li>`);

  }
  
  // Only change code above this line

  return failureItems;
}

const failuresList = makeList(result.failure);
console.log(failuresList);

`和${都是必不可少的。

Template Literals。

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