JavaScript 访问字符串字符作为数组
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JavaScript access string chars as array
提问by Francisc
Is it ok to do this:
这样做可以吗：
var myString="Hello!";
alert(myString[0]); // shows "H" in an alert window
Or should it be done with either charAt(0) or substr(0,1)? By "is it ok" I mean will it work on most browsers, is there a best practice recommandation that says otherwise etc.
还是应该用 charAt(0) 或 substr(0,1) 来完成？“可以吗”我的意思是它可以在大多数浏览器上工作，是否有最佳实践建议，否则等等。
Thank you.
谢谢你。
采纳答案by Saul
Using charAtis probably the best idea since it conveys the intent of your code most accurately. Calling substrfor a single character is definitely an overkill.
使用charAt可能是最好的主意，因为它最准确地传达了代码的意图。调用substr单个字符绝对是一种矫枉过正。
alert(myString.charAt(0));
回答by Tim Down
Accessing characters as numeric properties of a string is non-standard prior to ECMAScript 5 and doesn't work in all browsers(for example, it doesn't work in IE 6 or 7). You should use myString.charAt(0)instead when your code has to work in non-ECMAScript 5 environments. Alternatively, if you're going to be accessing a lot of characters in the string then you can turn a string into an array of characters using its split()method:
在 ECMAScript 5 之前，将字符作为字符串的数字属性访问是非标准的，并且不适用于所有浏览器（例如，它不适用于 IE 6 或 7）。myString.charAt(0)当您的代码必须在非 ECMAScript 5 环境中工作时，您应该使用它。或者，如果您要访问字符串中的大量字符，则可以使用其split()方法将字符串转换为字符数组：
var myString = "Hello!";
var strChars = myString.split("");
alert(strChars[0]);
回答by James
2018 answer: Yes it is OKto access strings like arrays.
2018 年回答：是的，可以访问数组之类的字符串。
The syntax is clear and concise. IE6 and IE7 are long gone. I see no reason not to use it.
语法清晰简洁。IE6 和 IE7 早已不复存在。我认为没有理由不使用它。
回答by Eric Bishard
In ES6 we can use destructuring since a string can be treated as an array:
在 ES6 中，我们可以使用解构，因为字符串可以被视为数组：
const [...rest] = 'Hello!';
console.log(rest)
> Array ["H", "e", "l", "l", "o", "!"]
console.log(rest[0])
> "H"
