如何在不分割单词的情况下将字符限制设置为100？

Question

我想每100个字符切一个字符串而不切掉单词。

var TmpArray=[];
var str = 'this string will be cut up after every 100 characters but it will cut into words';
str=str.replace(/[^a-z A-Z0-9]+/g, '');
str = str.replace(/\s{2,}/g, ' ');
var sp=(str.match(new RegExp(" ", "g")) || []).length;
var max=100;
//Spaces will be converted into %20 (later) so each space must count as 3 characters.
var FoundSpaces=sp*3;
var tmp=max-FoundSpaces;
var cut=str.match(new RegExp('.{1,'+tmp+'}', 'g'));
for (i = 0; i < cut.length; i++){
    TmpArray.push(cut[i]);
}
console.log(TmpArray);

输出： ["this string will be cut up after every 100 characters b", "ut it will cut into words"]

那么如何防止它像以前那样分裂单词呢？

Answer 1

有趣的问题。 我将提出另一种实现方法，说明如何使用数组方法以及split + reduce组合：

 var str = 'This example of the string that we want to split by spaces only making sure that individual chunk is less or equal to specified number.'; // Split by spaces str.split(/\\s+/) // Then join words so that each string section is less then 40 .reduce(function(prev, curr) { if (prev.length && (prev[prev.length - 1] + ' ' + curr).length <= 40) { prev[prev.length - 1] += ' ' + curr; } else { prev.push(curr); } return prev; }, []) // Print for testting .forEach(function(str) { console.log(str + ' ' + str.length); }); 

对于此示例，我将最大长度设置为40个字符。

输出：

This example of the string that we want 39
to split by spaces only making sure that 40
individual chunk is less or equal to 36
specified number. 17

另一个演示： http : //jsfiddle.net/9tgo6n1t/