jQuery 将文本附加到属性而不是替换它？
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Append text to an attribute rather than replacing it?
提问by gravitation
I want to append some text to the title attribute of all elements of a certain class.
我想在某个类的所有元素的 title 属性中附加一些文本。
回答by Kharisma Wijaya
I know this question is 7 years old. Just in case someone came across this question, here's the solution without using .each:
我知道这个问题已经有 7 年的历史了。以防万一有人遇到这个问题，这里是不使用 .each 的解决方案：
$('.theclass').attr("title", function() { return $(this).attr("title") + "Appended text." });
回答by strager
回答by Seth Battis
JQuery has come a ways. There's a version of .attr()that takes a function as the value argument:
JQuery 有办法。有一个版本的.attr()将函数作为值参数：
$('.theclass').attr('title', (i, value) => `${value || ""}appended text`);
iis the index of the attribute, valueis the current value of the attribute... which might not be set, hence the value || ""expression, to avoid converting undefinedinto the string 'Undefined'uglily.
i是属性的索引，是属性value的当前值......可能没有设置，因此是value || ""表达式，以避免转换undefined为'Undefined'丑陋的字符串。
