mirror of https://github.com/jkjoy/sunpeiwen.git
32 lines
816 B
JavaScript
32 lines
816 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
function truncate(str, options = {}) {
|
||
|
|
if (typeof str !== 'string') throw new TypeError('str must be a string!');
|
||
|
|
|
||
|
|
const length = options.length || 30;
|
||
|
|
const omission = options.omission || '...';
|
||
|
|
const { separator } = options;
|
||
|
|
const omissionLength = omission.length;
|
||
|
|
|
||
|
|
if (str.length < length) return str;
|
||
|
|
|
||
|
|
if (separator) {
|
||
|
|
const words = str.split(separator);
|
||
|
|
let result = '';
|
||
|
|
let resultLength = 0;
|
||
|
|
|
||
|
|
for (const word of words) {
|
||
|
|
if (resultLength + word.length + omissionLength < length) {
|
||
|
|
result += word + separator;
|
||
|
|
resultLength = result.length;
|
||
|
|
} else {
|
||
|
|
return result.substring(0, resultLength - 1) + omission;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
return str.substring(0, length - omissionLength) + omission;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = truncate;
|