jquery - 使用正则表达式连接数组元素

Question

是否可以使用正则表达式连接数组元素？如果是这样，我如何达到这些要求？

• 每个元素都应该用一个空格字符连接，除非它是一个空元素。
• 空数组元素应与换行符 ( \n) 连接。

这意味着：

["Hello, this is a sentence.", "This is another sentence.", "", "", "Then, there are 2 new lines.","","Then just one new line."]

应该转换.join为：

Hello, this is a sentence. This is another sentence.

Then, there are 2 new lines.
Then just one new line.

Answer 1

<br />循环遍历数组，用或\n根据您使用字符串的位置替换空元素，然后将其加入"".

for (var i = 0; i < myArr.length; i++) {
    myArr[i] = myArr[i] === "" ? "\n" : myArr[i];
}
var myStr = myArr.join("");

编辑：这是一个完整的演示，包含您的附加要求：http: //jsfiddle.net/auAAH/

var myArr = ["Hello, this is a sentence.", "This is another sentence.", "", "", "Then, there are 2 new lines.", "", "Then just one new line."];
for (var i = 0; i < myArr.length; i++) {
    if (myArr[i] === "") {
        myArr[i] = "\n";
        if (i !== 0 && myArr[i - 1] !== "\n") {
            myArr[i - 1] = myArr[i - 1].replace(/ $/, "");
        }
    }
    else if (i < myArr.length-1) {
     myArr[i] = myArr[i] + " ";   
    }
}
var myStr = myArr.join("");
document.getElementsByTagName("textarea")[0].value = myStr​;​

Answer 2

var string = "";

for(var index = 0; index < elements.length; index++) {
    var lastElement = elements[index -1];
    string += elements[index] !== "" ? (lastElement && lastElement !== ""? " " + elements[index] : elements[index]) : "\n";
}
console.log(string);

演示

Answer 3

您应该首先使用匹配/替换循环根据您的规则修改元素，然后您应该.join使用结果数组。