如何验证电子邮件地址是唯一的 [英] How to verify that email addresses are unique
本文介绍了如何验证电子邮件地址是唯一的的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在寻找一个JavaScript或jQuery解决方案。
解决方案
要在数组中找到重复项，请将元素插入到字典中，以跟踪每个元素出现的次数。那么计数大于1的每个元素都是重复的。
演示：
function findDuplicates（data）{var counts = {}; data.forEach（function（item）{if（counting [item] === undefined）{counting [item] = 1;} else {counting [item] + = 1; if（counting [item] == 2）{ print（'duplicate：'+ item）;}}}）;} function print（s）{document.write（s +'< br />'）;} var addresses = ['abc@xyz.com' ，'foo@bar.com'，'abc@xyz.com'，'babar@elephants.com'，'president@whitehouse.gov'，'babar@elephants.com'，'abc@xyz.com']; findDuplicates（addresses）;
I have a form containing 10 to 15 email addresses. How can I check whether all addresses are unique? And how can I determine which ones are duplicates?
I'm looking for a JavaScript or jQuery solution.
解决方案
To find duplicates in an array, insert the elements into a dictionary that keeps track of the number of times each element appears. Then each element with a count greater than 1 is a duplicate.
Demonstration:
function findDuplicates(data) {
var counts = {};
data.forEach(function (item) {
if (counts[item] === undefined) {
counts[item] = 1;
} else {
counts[item] += 1;
if (counts[item] == 2) {
print('duplicate: ' + item);
}
}
});
}
function print(s) {
document.write(s + '<br />');
}
var addresses = ['abc@xyz.com', 'foo@bar.com', 'abc@xyz.com', 'babar@elephants.com', 'president@whitehouse.gov', 'babar@elephants.com', 'abc@xyz.com'];
findDuplicates(addresses);
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