如何在字符串中循環字符串數組

Question

const names = 'const names = ["jhon", "anna", "kelvin"]'

如何獲取名稱數組，以便我可以循環遍歷它

例如 names.forEach(name => console.log(name))

// 預期結果 jhon, anna, kelvin

Answer 1

您可以在此處使用match()來隔離數組，然后使用split()來獲取名稱列表。

 var names = 'const names = ["jhon", "anna", "kelvin"]'; var vals = names.match(/\["(.*?)"\]/)[1].split(/",\s*"/).forEach(name => console.log(name));

Answer 2

eval('const names = ["jhon", "anna", "kelvin"]');
for(let name : names)
console.log(name);

Answer 3

你可以試試這個：

 let testCase1 = 'const names = ["jhon", "anna", "kelvin"]'; let testCase2 = 'var names = ["cane", "anna", "abel", 1, {}, []]'; let testCase3 = 'var names = ["cane" "anna", "abel", 1, {}, []]'; function getArrayLikeInsideText(text) { const regex = new RegExp(/\[.*\]/, 'g'); const temp = text.match(regex); let arr; try { arr = JSON.parse(temp); } catch { return undefined; } const gotAnArray = Array.isArray(arr); return gotAnArray? arr: undefined; } console.log(getArrayLikeInsideText(testCase1)); // ["jhon", "anna", "kelvin"] console.log(getArrayLikeInsideText(testCase2)); // ["cane", "anna", "abel", 1, {}, []] console.log(getArrayLikeInsideText(testCase3)); // undefined

Answer 4

您可以在String.match()方法的幫助下使用RegEx來簡單地實現這一點。

現場演示：

 const names = 'const names = ["jhon", "anna", "kelvin"]'; const a = names.match(/\[.*\]/g)[0]; JSON.parse(a).forEach(name => console.log(name));

\[.*\] - 包括開/關括號以及內容。