\u4e00\u3001\u5b9e\u73b0\u6548\u679c
\n\u7eff(10\u79d2)\u2192\u9ec4(5\u79d2)\u2192\u7ea2(10\u79d2)\u2192\u7eff(10\u79d2)\u2026\u4f9d\u6b21\u5faa\u73af\u3002<\/p>\n
\u4e8c\u3001\u4ee3\u7801\u5206\u6790
\n\u9996\u5148\u7f16\u5199html\u4ee3\u7801\uff0c\u4f7f\u7528CSS\u786e\u5b9a\u9700\u8981\u6539\u53d8\u7684div\u3002\u5176\u6b21\u7f16\u5199JavaScript\u4ee3\u7801\uff0c\u901a\u8fc7\u4fee\u6539\u80cc\u666f\u989c\u8272\u7684\u65b9\u5f0f\uff0c\u8bbe\u7f6e\u4fe1\u53f7\u706f\u6837\u5f0f\u3002\u6700\u540e\u5b9e\u73b0\u7ea2\u7eff\u706f\u8bfb\u79d2\uff0c\u5229\u7528setInterval()\u548csetTimeout()\u51fd\u6570\u5b8c\u6210\u4fe1\u53f7\u706f\u8bfb\u79d2\u7684\u52a8\u6001\u6539\u53d8\u6548\u679c\u3002<\/p>\n
\u4e09\u3001\u4ee3\u7801\u5b9e\u73b0<\/p>\n
1.\u7f16\u5199HTML\u4ee3\u7801
\n<body>
\n<div class=”trfc_lts1″>
\n<div id=”redLight” class=”light”><\/div> <!– \u7ea2\u706f –>
\n<div id=”yellowLight” class=”light”><\/div> <!– \u9ec4\u706f –>
\n<div id=”greenLight” class=”light”><\/div> <!– \u7eff\u706f –>
\n<\/div>
\n<div id=”countDown”><\/div> <!– \u5012\u8ba1\u65f6 –>
\n<button onclick=”startChange()”>\u5f00\u59cb\u5de5\u4f5c<\/button>
\n<\/body>
\n2.\u521d\u59cb\u5316
\n\u5c06\u4e09\u5757\u989c\u8272\u5168\u90e8\u53d8\u767d\uff0c\u53ef\u4ee5\u4e0d\u5199\u3002<\/p>\n
function startChange() {
\nlet redObj = document.getElementById(“redLight”);
\nlet yellowObj = document.getElementById(“yellowLight”);
\nlet greenObj = document.getElementById(“greenLight”);
\nredObj.style.backgroundColor = “white”;
\nyellowObj.style.backgroundColor = “white”;
\ngreenObj.style.backgroundColor = “white”;<\/p>\n
toGreen();
\n}
\ntoGreen()\uff1a\u4f7f\u4fe1\u53f7\u706f\u7531\u7ea2\u53d8\u7eff\u3002<\/p>\n
3.\u5b9e\u73b0\u7ea2\u7eff\u706f\u53d8\u5316
\n\u8fd9\u91cc\u4ee5\u53d8\u6210\u7eff\u8272\u4e3a\u4f8b\uff0c\u53d8\u6210\u5176\u4ed6\u989c\u8272\u7684\u51fd\u6570\u662f\u7c7b\u4f3c\u7684\u3002<\/p>\n
function toGreen() { <!– \u53d8\u6210\u7eff\u8272 –>
\nlet redObj = document.getElementById(“redLight”);
\nlet greenObj = document.getElementById(“greenLight”);
\nredObj.style.backgroundColor = “white”;
\ngreenObj.style.backgroundColor = “green”;
\ndocument.getElementById(‘countDown’).style.color=’green’;\/\/\u6570\u5b57\u989c\u8272\u76f8\u5e94\u4fe1\u53f7\u706f\u6539\u53d8
\nlet timer = 9;
\ncountDown(timer);
\nsetTimeout(“toYellow()”,(timer+1)*1000); <!– 1000ms == 1s –>
\n}
\ntimer\uff1a\u5b58\u50a8\u5bf9\u5e94\u4fe1\u53f7\u706f\u5269\u4f59\u4eae\u706f\u65f6\u95f4\u3002\uff08\u6ce8\uff1a\u8fd9\u91cc\u7684timer\u8d4b\u503c\u4e3a9(\u5c11\u4e86\u4e00\u79d2)\uff0c\u662f\u7531\u4e8e\u5355\u7ebf\u7a0b\u7684\u7f18\u6545\uff0c\u989c\u8272\u6539\u53d8\u7684\u540c\u65f6\u5012\u8ba1\u65f6\u5e76\u4e0d\u4f1a\u5f00\u59cb(\u4f1a\u7b49\u4e00\u79d2)\uff0c\u56e0\u6b64\u5728\u540e\u9762\u7684countDown()\u51fd\u6570\u548csetTimeout\u91cc\u5bf9timer\u52a0\u4e00\uff0c\u5bf9\u9f50\u65f6\u95f4\u3002\uff09<\/p>\n
countDown()\uff1a\u5012\u8ba1\u65f6\u51fd\u6570\u3002<\/p>\n
4.\u5b9e\u73b0\u7ea2\u7eff\u706f\u5012\u8ba1\u65f6
\nfunction countDown(timer){
\ndocument.getElementById(‘countDown’).innerHTML = timer+1; \/\/\u5bf9\u5e94\u989c\u8272\u663e\u793a\u521d\u59cb\u6570\u5b57
\nsetInterval(() => {
\nif (timer >= 0) {
\ndocument.getElementById(‘countDown’).innerHTML = timer–; \/\/\u5012\u6570
\n}
\n}, 1000);
\n}
\n\u5229\u7528setInterval()\u51fd\u6570\uff0c\u5728\u6bcf\u96941\u79d2\u949f\u95f4\u6b47\u8c03\u7528\u4e00\u6b21\u533f\u540d\u51fd\u6570\u3002<\/p>\n
5.CSS\u76f8\u5173
\n.trfc_lts1{
\nwidth: 220px;
\nheight: 618px;
\nfloat: left;
\nborder: 1px solid black;
\n}
\n.trfc_lts1 .light{
\nwidth: 200px;
\nheight: 200px;
\nborder-radius: 100%;
\nborder:3px solid black;
\n}
\n.trfc_lts1 #redLight{
\nbackground-color: red;
\nmargin-left: 7px;
\n}
\n.trfc_lts1 #yellowLight{
\nbackground-color: yellow;
\nmargin-left: 7px;
\n}
\n.trfc_lts1 #greenLight{
\nbackground-color: green;
\nmargin-left: 7px;
\n}
\n#countDown{
\nmargin-left: 10px;
\nwidth: 202px;
\nheight: 202px;
\nfont-size: 155px;
\nfloat: left;
\nborder: 2px solid black;
\nbackground-color: gray;
\n}<\/p>\n
\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014
\n\u7248\u6743\u58f0\u660e\uff1a\u672c\u6587\u4e3aCSDN\u535a\u4e3b\u300cDDD_duck\u300d\u7684\u539f\u521b\u6587\u7ae0\uff0c\u9075\u5faaCC 4.0 BY-SA\u7248\u6743\u534f\u8bae\uff0c\u8f6c\u8f7d\u8bf7\u9644\u4e0a\u539f\u6587\u51fa\u5904\u94fe\u63a5\u53ca\u672c\u58f0\u660e\u3002
\n\u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/blog.csdn.net\/qq_54108778\/article\/details\/118061151<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u3001\u5b9e\u73b0\u6548\u679c \u7eff(10\u79d2)\u2192\u9ec4(5\u79d2)\u2192\u7ea2(10\u79d2)\u2192\u7eff(1…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-810","post","type-post","status-publish","format-standard","hentry","category-htmlcss"],"_links":{"self":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/810","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/comments?post=810"}],"version-history":[{"count":1,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/810\/revisions"}],"predecessor-version":[{"id":1240,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/810\/revisions\/1240"}],"wp:attachment":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/media?parent=810"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/categories?post=810"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/tags?post=810"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}