定義您的規則：[！？] // 1.句子以大寫字母 // 2.句子是由什麼或之前開始的，但不是[，：;] // 3.如果格式不正確，則可以在引號之前加上引號，例如[「'] // 4.如果引用之後的單詞是名稱
任何其他規則
定義你的目的： // 1.刪除最後一句
假設： 如果從最後一個字符的文本字符串的開始和向後工作，那麼你會找出句子的開頭： 1。字符前面的文本字符串是[。？！]或 2.字符前面的文本字符串是[「']，前面是大寫字母 3.每個[。]前面都有一個空格 4。我們不糾正html標籤 5.這些假設不健全，需要定期修改
可能的解決方案： 讀入您的字符串並將其拆分到空格字符上，以給我們大量字符串進行反向查看。
var characterGroups = $('#this-paragraph').html().split(' ').reverse();
如果你的字符串是：
BLABLA，這裏一些文字。有時使用基本的html代碼，但不應該使句子的「選擇」更難！我擡頭看窗戶，我看到一架飛機飛過。我問了第一個想到的事情：「那裏有什麼？」她不知道，「我認爲我們應該越過圍欄！」，她很快說。他後來形容爲：「瘋狂的東西。「
var originalString = 'Blabla, some more text here. Sometimes <span>basic</span> html code is used but that should not make the "selection" of the sentence any harder! I looked up the window and I saw a plane flying over. I asked the first thing that came to mind: "What is it doing up there?" She did not know, "I think we should move past the fence!", she quickly said. He later described it as: "Something insane."';
然後你在characterGroups陣列將是：
["insane."", ""Something", "as:", "it", "described", "later", "He",
"said.", "quickly", "she", "fence!",", "the", "past", "move", "should", "we",
"think", ""I", "know,", "not", "did", "She", "there?"", "up", "doing", "it",
"is", ""What", "mind:", "to", "came", "that", "thing", "first", "the", "asked",
"I", "over.", "flying", "plane", "a", "saw", "I", "and", "window", "the", "up",
"looked", "I", "harder!", "any", "sentence", "the", "of", ""selection"", "the",
"make", "not", "should", "that", "but", "used", "is", "code", "html", "basic",
"Sometimes", "here.", "text", "more", "some", "Blabla,"]
注：的'標籤和其他人使用的.text（）方法來去除jQuery中
每個塊後跟一個空格，所以當我們確定了我們的句子開始位置（通過數組索引）時，我們將知道該空間有什麼索引，並且我們可以將原始字符串拆分爲l這個空間佔據了句子結尾的那個索引。
給自己一個變量來標記，如果我們發現與否和一個變量來保存的數組元素的索引位置，我們確定爲保持最後一句的開頭：
var found = false;
var index = null;
遍歷數組，並尋找任何元素結束[。！？]或「前一個元素開始以大寫字母在那裏結束。
var position = 1,//skip the first one since we know that's the end anyway
elements = characterGroups.length,
element = null,
prevHadUpper = false,
last = null;
while(!found && position < elements) {
element = characterGroups[position].split('');
if(element.length > 0) {
last = element[element.length-1];
// test last character rule
if(
last=='.' // ends in '.'
|| last=='!' // ends in '!'
|| last=='?' // ends in '?'
|| (last=='"' && prevHadUpper) // ends in '"' and previous started [A-Z]
) {
found = true;
index = position-1;
lookFor = last+' '+characterGroups[position-1];
} else {
if(element[0] == element[0].toUpperCase()) {
prevHadUpper = true;
} else {
prevHadUpper = false;
}
}
} else {
prevHadUpper = false;
}
position++;
}
如果你運行上面的腳本會正確識別‘他’爲最後一句的開頭
0123再次
var trimPosition = originalString.lastIndexOf(lookFor)+1;
var updatedString = originalString.substr(0,trimPosition);
console.log(updatedString);
// Blabla, some more text here. Sometimes <span>basic</span> html code is used but that should not make the "selection" of the sentence any harder! I looked up the window and I saw a plane flying over. I asked the first thing that came to mind: "What is it doing up there?" She did not know, "I think we should move past the fence!", she quickly said.
運行，並得到： BLABLA，這裏一些文字現在
console.log(characterGroups[index]); // He at index=6
，你可以通過你收到的字符串運行。有時使用基本的html代碼，但不應該使句子的「選擇」更難！我擡頭看窗戶，我看到一架飛機飛過。我問了第一個想到的事情：「那裏有什麼？」
再次運行它並得到： Blabla，一些更多的文字在這裏。有時使用基本的html代碼，但不應該使句子的「選擇」更難！我擡頭看窗戶，我看到一架飛機飛過。
再次運行它並得到： Blabla，一些更多的文字在這裏。有時使用基本的html代碼，但不應該使句子的「選擇」更難！
再次運行它並得到： Blabla，一些更多的文字在這裏。
再次運行它並得到： Blabla，一些更多的文字在這裏。
所以，我認爲這符合你在找什麼？
作爲一個功能：
function trimSentence(string){
var found = false;
var index = null;
var characterGroups = string.split(' ').reverse();
var position = 1,//skip the first one since we know that's the end anyway
elements = characterGroups.length,
element = null,
prevHadUpper = false,
last = null,
lookFor = '';
while(!found && position < elements) {
element = characterGroups[position].split('');
if(element.length > 0) {
last = element[element.length-1];
// test last character rule
if(
last=='.' || // ends in '.'
last=='!' || // ends in '!'
last=='?' || // ends in '?'
(last=='"' && prevHadUpper) // ends in '"' and previous started [A-Z]
) {
found = true;
index = position-1;
lookFor = last+' '+characterGroups[position-1];
} else {
if(element[0] == element[0].toUpperCase()) {
prevHadUpper = true;
} else {
prevHadUpper = false;
}
}
} else {
prevHadUpper = false;
}
position++;
}
var trimPosition = string.lastIndexOf(lookFor)+1;
return string.substr(0,trimPosition);
}
是微不足道的做一個插件，如果，但要小心的假設！ :)
這有幫助嗎？
感謝， AE
定義「最後一句」和「長字符串」。如果您正在尋找限制文本中行數的方法，請參閱** [此答案]（http://stackoverflow.com/questions/7519337/given-a-textarea-is-there-a-方式對限制長度基於上的線/ 7521855＃7521855）**。 –
編輯我的問題，通過句子我的意思是一個真正的句子，見上文。 :) – bartolsthoorn
***他後來形容爲：「瘋狂的東西。」***我不是英語專業..但這是正確的嗎？或者它應該是***他後來形容它是「瘋狂的東西」。*** – rlemon