var email = 'abc@163.com'
var sp = 'https://mail.' + email.substring(email.indexOf('@')+1,email.length)
console.log(sp)
结果：https://mail.163.com
var email = 'abc@163.com'
var sp = 'https://mail.' + email.substring(email.indexOf('@')+1,email.length)
console.log(sp)
结果：https://mail.163.com本文标题：javascript截取@之后的字符串
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