本文實(shí)例講述了js實(shí)現(xiàn)倒計(jì)時(shí)重新發(fā)送短信驗(yàn)證碼功能的方法。分享給大家供大家參考,具體如下:
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>js-手機(jī)發(fā)送短信倒計(jì)時(shí)</title> <style> button{ width: 100px; height: 30px; border: none; } input{ outline: none; } </style> <script> window.onload = function(){ function $(id){ return document.getElementById(id); } $('btn').onclick = function(){ clearInterval(timer); //清除計(jì)時(shí)器 var that = this; that.disabled = true; var count = 5; var timer = setInterval(function(){ if(count>0){ count--; that.innerHTML = "剩余時(shí)間"+ count +"s"; }else{ that.innerHTML ="重新發(fā)送短信"; that.disabled = false; clearInterval(timer); //清除計(jì)時(shí)器 } },1000); } } </script></head><body> <div class="box"> <input type="text" id="txt"> <button id="btn" >點(diǎn)擊發(fā)送短信</button> </div></body></html> 或者使用setTimeout來(lái)模擬,一般情況下,還是推薦使用setTimeout,更安全一些。當(dāng)使用setInterval(fn,1000)時(shí),程序是間隔1s執(zhí)行一次,但是每次程序執(zhí)行是需要3s,那么就要等程序執(zhí)行完才能執(zhí)行下一次,即實(shí)際間隔時(shí)間為(間隔時(shí)間和程序執(zhí)行時(shí)間兩者的最大值)。而setTimeout(fn,1000),代表的是,延遲1s再執(zhí)行程序,且僅執(zhí)行一次。每次程序執(zhí)行是需要3s,所以實(shí)際時(shí)間為 1s+3s=4s。可以使用setTimeout遞歸調(diào)用來(lái)模擬setInterval。
<script> window.onload = function(){ function $(id){ return document.getElementById(id); } $('btn').onclick = function(){ var that = this; that.disabled = true; var count = 5; var timer = setTimeout(fn,1000); function fn(){ count--; if(count>0){ that.innerHTML = "剩余時(shí)間"+ count +"s"; setTimeout(fn,1000); }else{ that.innerHTML ="重新發(fā)送短信"; that.disabled = false; } } } } </script>以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持VeVb武林網(wǎng)。
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