Question

我有一份唱歌清单：

var sings = [",",".",":","!","?"]

如何检查某个单词是否包含其中一个符号并将其返回？

例如：

"But,"

return ","

"Finished."

return "."

"Questions?"

return "?"

Answer 1

你可以用正则表达式解决这个问题：

function match(input) {
  var regex = /([,\.\:!\?])/;
  var matches = input.match(regex);
  return matches ? matches[0] : false;
}

console.log(match("foo?"));   // "?"
console.log(match("bar."));   // "."
console.log(match("foobar")); // false

Answer 2

这是示例函数

var checkSigns = function(str) {
    var signs = [",",".",":","!","?"];

    for (var i = 0; i < signs.length; i++) {
        if (str.indexOf[signs[i]] !== -1) {
            return signs[i];
        }
    }
};

Answer 3

您可以使用filter()和indexOf()并返回在字符串中找到的符号数组。

＆＃13;

var signs = [",",".",":","!","?"];
function check(str, arr) {
  return arr.filter(function(e) {
    return str.indexOf(e) != -1
  })
}

console.log(check("But,", signs))
console.log(check("Finished.", signs))

＆＃13;

Answer 4

如果包含，请尝试此原型str.hasSign();返回sign或如果不包含false。

String.prototype.hasSigns = function() {
  var signs = [",", ".", ":", "!", "?"];
  for (var i = 0; i < signs.length; i++) {
    if (this.indexOf(signs[i]) > -1) return signs[i];
  }
  return false;
}

console.log("football, basketball".hasSigns());

console.log("1-3".hasSigns());

console.log("Good!".hasSigns());

如何检查字符串是否包含符号列表？

4 个答案: