Javascript 如何使用jquery限制多个元素的字符串长度？

我想限制我所有$（“a.paragration”）的字符串长度。我有以下代码：

var paragraph = $("a.paragraph").text();
var maxlength = 500;
var strlength = paragraph.length;
if (strlength > maxlength) {
    var introduction    = paragraph.substr(0,maxlength); // cut string
    var search          = introduction.lastIndexOf(" "); // find position of last space (last word cannot be cut)
    introduction        = introduction.substr(0, search); // cut string until last space
    introduction        = introduction + "..."; // add ... in the end
    $("a.paragraph").text(introduction);
}

此代码仅重写第一个元素，并在所有段落上显示结果。如何循环每个段落？

您可以利用：

使用：

---

您需要找到每个段落并围绕它们循环：

$("a.paragraph").each(function() {
    var paragraph = $(this).text();
    var maxlength = 500;
    var strlength = paragraph.length;
    if (strlength > maxlength) {
        var introduction    = paragraph.substr(0,maxlength); // cut string
        var search          = introduction.lastIndexOf(" "); // find position of last space (last word cannot be cut)
        introduction        = introduction.substr(0, search); // cut string until last space
        introduction        = introduction + "..."; // add ... in the end
        $("a.paragraph").text(introduction);
    }
});

---

您需要在每个元素上循环。您所经历的行为是jQuery默认的工作方式

$("a.paragraph").each(function(i,e) {
    var paragraph = $(e).text();
    var maxlength = 500;
    var strlength = paragraph.length;
    if (strlength > maxlength) {
        var introduction    = paragraph.substr(0,maxlength); // cut string
        var search          = introduction.lastIndexOf(" "); // find position of last space (last word cannot be cut)
        introduction        = introduction.substr(0, search); // cut string until last space
        introduction        = introduction + "..."; // add ... in the end
        $(e).text(introduction);
    }
});

---

谢谢，这正是我想要的。我试了每一个，但忘了用“这个”。

$("a.paragraph").each(function() {
    var paragraph = $(this).text();
    var maxlength = 500;
    var strlength = paragraph.length;
    if (strlength > maxlength) {
        var introduction    = paragraph.substr(0,maxlength); // cut string
        var search          = introduction.lastIndexOf(" "); // find position of last space (last word cannot be cut)
        introduction        = introduction.substr(0, search); // cut string until last space
        introduction        = introduction + "..."; // add ... in the end
        $("a.paragraph").text(introduction);
    }
});

$("a.paragraph").each(function(i,e) {
    var paragraph = $(e).text();
    var maxlength = 500;
    var strlength = paragraph.length;
    if (strlength > maxlength) {
        var introduction    = paragraph.substr(0,maxlength); // cut string
        var search          = introduction.lastIndexOf(" "); // find position of last space (last word cannot be cut)
        introduction        = introduction.substr(0, search); // cut string until last space
        introduction        = introduction + "..."; // add ... in the end
        $(e).text(introduction);
    }
});