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基于空格和长度将字符串分成两行的条件语句

conditional function string javascript

KatherineMichelle · 技术社区 · 6 年前

我有一个函数可以把一个字符串分成两行。它根据空白空间的位置断开字符串:

 splitSentenceInHalfCC(sentence: string): [string, string] {
    let middle = Math.floor(sentence.length / 2);
    let before = sentence.lastIndexOf(' ', middle);
    let after = sentence.indexOf(' ', middle + 1);


    if (middle - before < after - middle || after === -1) {
      middle = before;
    } else {
      middle = after;
    }

    let s1 = sentence.substr(0, middle);
    let s2 = sentence.substr(middle + 1);

    return [s1, s2];
  }

我现在要做的是添加一个if语句,如果没有空格,它将在前15个字符后将字符串分成两行。我怎样才能做到这一点?我对这件事还不太熟悉,所以不知道该怎么办。谢谢您。

Example #1 input: This is a Store name and it is detailed.
Example #1 output: This is a Store name 
                   and it is detailed.
Example #2 input: Thisisjustalongstorenamewithnospaces.
Example #2 output: Thisisjustalongstorename
                   withnospaces.

2 回复 | 直到 6 年前

CertainPerformance 6 年前

我想你需要做的就是,在函数的一开始,检查一下这个句子 .includes 空格-如果不是,则返回一个包含两项的数组 slice 从0到35,然后从35开始。(当然,如果要更改字符数,只需更改 35 提供给的参数 .slice )

function splitSentenceInHalfCC(sentence) {
  if (!sentence.includes(' ')) {
    return [
      sentence.slice(0, 35),
      sentence.slice(35),
    ]
  }

  let middle = Math.floor(sentence.length / 2);
  let before = sentence.lastIndexOf(' ', middle);
  let after = sentence.indexOf(' ', middle + 1);


  if (middle - before < after - middle || after === -1) {
    middle = before;
  } else {
    middle = after;
  }

  let s1 = sentence.substr(0, middle);
  let s2 = sentence.substr(middle + 1);

  return [s1, s2];
}
console.log(splitSentenceInHalfCC('This is a Store name and it is detailed.'));
console.log(splitSentenceInHalfCC('Thisisjustalongstorenamewithnospaces.'));

Aakash More 6 年前

检查字符串是否有空格。

 splitSentenceInHalfCC(sentence: string): [string, string] {
    let middle = Math.floor(sentence.length / 2);
    let before = sentence.lastIndexOf(' ', middle);
    let after = sentence.indexOf(' ', middle + 1);


    if (middle - before < after - middle || after === -1) {
      middle = before;
    } else {
      middle = after;
    }

    if( before === -1 && after === -1 ){
       middle = 35;
    }

    let s1 = sentence.substr(0, middle);
    let s2 = sentence.substr(middle + 1);

    return [s1, s2];
  }

注意:您可能需要以数字为基数 35 在字符串长度上。