{"id":2482,"date":"2020-11-15T13:33:11","date_gmt":"2020-11-15T05:33:11","guid":{"rendered":"http:\/\/admin.evshou.com\/?p=2482"},"modified":"2020-11-23T11:24:40","modified_gmt":"2020-11-23T03:24:40","slug":"2020javaweb%e6%95%99%e7%a8%8b%e4%b9%8bjavascript%e7%9a%84dom2","status":"publish","type":"post","link":"https:\/\/www.9713job.com\/?p=2482","title":{"rendered":"2020javaweb\u6559\u7a0b\u4e4bJavaScript\u7684DOM2"},"content":{"rendered":"

2020javaweb\u6559\u7a0b\u4e4bJavaScript\u7684DOM2<\/h3>\n

DOM\u6982\u8ff0\uff1a<\/strong><\/span><\/p>\n

\u901a\u8fc7 HTML DOM,\u4f7f\u7528 JavaScript\u8bbf\u95ee HTML \u6587\u6863\u7684\u6240\u6709\u5143\u7d20\u3002<\/p>\n

\u5f53\u7f51\u9875\u88ab\u52a0\u8f7d\u65f6\uff0c\u6d4f\u89c8\u5668\u4f1a\u521b\u5efa\u9875\u9762\u7684\u6587\u6863\u5bf9\u8c61\u6a21\u578b\uff08Document Object Model\uff09
\n\"\"<\/p>\n

\u6d4f\u89c8\u5668\u52a0\u8f7d HTML \u65f6,\u4f1a\u5c06\u6240\u6709\u7684 HTMl \u6807\u7b7e\u5c01\u88c5\u6210\u5bf9\u8c61(\u6807\u7b7e\u5bf9\u8c61),\u79f0\u4e3a\u8282\u70b9(Node),\u5e76\u60ac\u6302\u5728\u6811\u72b6\u7ed3\u6784\u4e2d<\/p>\n

\u5728HTML\u4e2d\uff0c\u4e00\u5207\u90fd\u662f\u8282\u70b9<\/strong><\/span><\/p>\n

\u5143\u7d20\u8282\u70b9\uff1aHTML\u6807\u7b7e\u3002<\/span>
\n\u6587\u672c\u8282\u70b9\uff1a\u6807\u7b7e\u4e2d\u6587\u5b57(\u6bd4\u5982\u6807\u7b7e\u4e4b\u95f4\u7684\u7a7a\u683c\u3001\u6362\u884c)<\/span>
\n\u5c5e\u6027\u8282\u70b9\uff1a\u6807\u7b7e\u7684\u5c5e\u6027<\/span><\/p>\n

\u5404\u8282\u70b9\u7684\u5173\u7cfb\u4f53\u73b0\u4e3a\uff1a\u7236\u5b50\u5173\u7cfb\/\u5144\u5f1f\u5173\u7cfb<\/span><\/p>\n

\u901a\u8fc7\u53ef\u7f16\u7a0b\u7684\u5bf9\u8c61\u6a21\u578b\uff0cjs\u83b7\u5f97\u4e86\u8db3\u591f\u7684\u80fd\u529b\u6765\u521b\u5efa\u52a8\u6001\u7684HTML<\/span>\uff1a
\nJavaScript \u80fd\u591f\u6539\u53d8\u9875\u9762\u4e2d\u7684\u6240\u6709 HTML \u5143\u7d20<\/span>\u3002
\nJavaScript \u80fd\u591f\u6539\u53d8\u9875\u9762\u4e2d\u7684\u6240\u6709 HTML \u5c5e\u6027<\/span>\u3002
\nJavaScript \u80fd\u591f\u6539\u53d8\u9875\u9762\u4e2d\u7684\u6240\u6709 CSS \u6837\u5f0f<\/span>\u3002
\nJavaScript \u80fd\u591f\u5bf9\u9875\u9762\u4e2d\u7684\u6240\u6709\u4e8b\u4ef6<\/span>\u505a\u51fa\u53cd\u5e94\u3002<\/p>\n

DOM\u7684\u8282\u70b9\u5c5e\u6027<\/span><\/strong><\/p>\n

\u5728\u6587\u6863\u5bf9\u8c61\u6a21\u578b (DOM) \u4e2d\uff0c\u6bcf\u4e2a\u8282\u70b9\u90fd\u662f\u4e00\u4e2a\u5bf9\u8c61\u3002DOM \u8282\u70b9\u6709\u4e09\u4e2a\u91cd\u8981\u7684\u5c5e\u6027 \uff1a<\/p>\n

1.nodeName\uff1a\u8282\u70b9\u7684\u540d\u79f0<\/span><\/strong><\/p>\n

<script type=\"text\/javascript\">\r\nconsole.log(document.body.nodeName<\/span>);\r\nconsole.log(document.body.attributes[0].nodeName<\/span>);\r\nconsole.log(document.getElementById(\"body\").childNodes[0].nodeName<\/span>);\r\n<\/script>\r\n\r\n<\/pre>\n
\"\"<\/p>\n
2.nodeValue\uff1a\u8282\u70b9\u7684\u503c<\/strong><\/span><\/p>\n
<body id=\"body\">\r\n<a href=\"#\" name=\"a\" id=\"aid\">\u6d4b\u8bd5<\/a>\r\n<script type=\"text\/javascript\">\r\n\/\/\u5143\u7d20\u8282\u70b9\u7684 nodeValue \u662f undefined \u6216 null\r\nconsole.log(document.head.nodeValue);\r\n\/\/\u6587\u672c\u8282\u70b9\u7684 nodeValue \u662f\u6587\u672c\u81ea\u8eab\r\nconsole.log(document.getElementById(\"aid\").childNodes[0].nodeValue);\r\n\/\/\u5c5e\u6027\u8282\u70b9\u7684 nodeValue \u662f\u5c5e\u6027\u7684\u503c\r\nconsole.log(document.getElementById(\"aid\").attributes[2].nodeValue);\r\n<\/script>\r\n<\/body>\r\n<\/pre>\n
\"\"<\/p>\n
3.nodeType\uff1a\u8282\u70b9\u7684\u7c7b\u578b<\/strong><\/span><\/p>\n
nodeType \u5c5e\u6027: \u8282\u70b9\u7684\u7c7b\u578b\uff0c\u662f\u53ea\u8bfb\u7684\u3002\u4ee5\u4e0b\u5e38\u7528\u7684\u51e0\u79cd\u7ed3\u70b9\u7c7b\u578b:<\/p>\n
\u5143\u7d20\u7c7b\u578b\uff1a\u8282\u70b9\u7c7b\u578b
\n\u5143\u7d20\uff1a1
\n\u5c5e\u6027\uff1a2
\n\u6587\u672c\uff1a3
\n\u6ce8\u91ca\uff1a8
\n\u6587\u6863\uff1a9<\/p>\n
\u83b7\u53d6\u7236\u8282\u70b9
\n\u8c03\u7528\u8005\u5c31\u662f\u8282\u70b9\u3002\u4e00\u4e2a\u8282\u70b9\u53ea\u6709\u4e00\u4e2a\u7236\u8282\u70b9\uff0c\u8c03\u7528\u65b9\u5f0f
\n<\/span><\/p>\n
console.log(document.body.parentNode)<\/p>\n
\u83b7\u53d6\u6240\u6709\u7684\u5b50\u8282\u70b9
\nchildNodes\uff1a\u6807\u51c6\u5c5e\u6027\u3002\u8fd4\u56de\u7684\u662f\u6307\u5b9a\u5143\u7d20\u7684\u5b50\u8282\u70b9\u7684\u96c6\u5408\uff08\u5305\u62ec\u5143\u7d20\u8282\u70b9\u3001\u6240\u6709\u5c5e\u6027\u3001\u6587\u672c\u8282\u70b9\uff09\u3002\u662fW3C\u7684\u4eb2\u513f\u5b50
\n<\/span><\/p>\n
document.body.childNodes<\/p>\n
\u83b7\u53d6\u5143\u7d20\u5c5e\u6027\u7684\u96c6\u5408<\/span><\/p>\n
console.log(document.body.attributes.length)<\/p>\n
 <\/p>\n
DOM\u5143\u7d20\u7684\u64cd\u4f5c<\/strong><\/span><\/p>\n
\u83b7\u53d6HTML\u5143\u7d20<\/p>\n
1.\u901a\u8fc7id\u83b7\u53d6HTML\u5143\u7d20<\/span><\/p>\n
\/\/\u901a\u8fc7id\u83b7\u53d6\u5143\u7d20
\nvar a1=document.getElementById(“a1″);
\n\/\/\u4fee\u6539id\u4e3aa1\u7684\u5185\u5bb9
\na1.innerText=”id\u4e3aa1\u7684\u6587\u672c”;<\/p>\n
2.\u901a\u8fc7\u6807\u7b7e\u540d\u83b7\u53d6HTML\u5143\u7d20<\/span><\/p>\n
\/\/\u901a\u8fc7\u6807\u7b7e\u83b7\u53d6\u5143\u7d20
\nvar a3=document.getElementsByTagName(“p”);
\nfor(var i=0;i<a3.length;i++){
\na3[i].innerText=”\u6807\u7b7ep\u83b7\u53d6\u5143\u7d20”;
\n}<\/p>\n
3.\u901a\u8fc7\u7c7b\u540d\u83b7\u53d6HTML\u5143\u7d20<\/span><\/p>\n
\/\/\u901a\u8fc7class\u83b7\u53d6\u5143\u7d20
\nvar a2=document.getElementsByClassName(“a2″);
\nfor(var i=0;i<a2.length;i++){
\na2[i].innerText=”2222”;
\n}<\/p>\n
\u4fee\u6539HTML\u6587\u672c<\/span><\/p>\n
a1.innerText=”id\u4e3aa1\u7684\u6587\u672c”;
\n\u6216
\na1.innerHTML=”id\u4e3aa1\u7684\u6587\u672c”;<\/p>\n
\u6539\u53d8HTML\u5c5e\u6027\u3001\u6539\u53d8css\u6837\u5f0f<\/span><\/p>\n
a1.style.color=”red”;<\/p>\n
 <\/p>\n
\u5143\u7d20\u7684CRUD<\/strong><\/span><\/p>\n
1.\u521b\u5efa\u5143\u7d20<\/span><\/p>\n
\/\/\u521b\u5efap\u6807\u7b7e
\nvar ps=document.createElement(“p”);
\n\/\/\u521b\u5efa\u6587\u672c\u8282\u70b9
\nvar ptext=document.createTextNode(“\u8fd9\u662f\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6bb5\u843d”);
\n\/\/\u5411p\u5143\u7d20\u8ffd\u52a0\u6587\u672c\u8282\u70b9
\nps.appendChild(ptext);
\n\/\/\u627e\u5230\u5df2\u6709\u7684\u5143\u7d20
\nvar div1=document.getElementById(“div1”);
\n\/\/\u5411\u5df2\u6709\u7684\u5143\u7d20\u540e\u6dfb\u52a0\u65b0\u5143\u7d20
\ndiv1.appendChild(ps);
\n\/\/\u5411\u5df2\u6709\u7684\u5143\u7d20\u540e\u6dfb\u52a0\u65b0\u5143\u7d20
\ndiv1.insertBefore(ps,ptext);
\n\"\"<\/p>\n
2.\u5220\u9664\u5143\u7d20<\/span><\/p>\n
\/\/\u627e\u5230\u5df2\u6709\u7684\u5143\u7d20
\nvar div1=document.getElementById(“div1”);
\n\/\/\u79fb\u9664id\u4e3adiv1\u5143\u7d20
\ndiv1.parentNode.parentNode.remove();
\n\"\"<\/p>\n
3.\u66ff\u6362\u5143\u7d20<\/span><\/p>\n
\/\/\u83b7\u53d6\u7236\u5143\u7d20
\nvar div1s=document.getElementById(“div1”);
\n\/\/\u521b\u5efap\u6807\u7b7e
\nvar ps=document.createElement(“p”);
\n\/\/\u521b\u5efa\u6587\u672c
\nvar texts=document.createTextNode(“\u8fd9\u662f\u88ab\u66ff\u6362\u7684\u6587\u672c”);
\n\/\/p\u6807\u7b7e\u6dfb\u52a0\u6587\u672c
\nps.appendChild(texts);
\n\/\/\u83b7\u53d6id\u4e3ap3
\nvar p3s=document.getElementById(“p3”);
\n\/\/\u7ed9\u7236\u5143\u7d20\u7684\u5b50\u8282\u70b9\u7684p3\u66ff\u6362
\ndiv1s.replaceChild(ps,p3s);
\n\"\"<\/p>\n
 <\/p>\n
DOM\u4e8b\u4ef6<\/strong><\/span><\/p>\n
\u6539\u53d8\u5143\u7d20\u6837\u5f0f<\/span><\/p>\n
<p id=”p1″ onclick=”changes(this)”>\u70b9\u51fb\u4fee\u6539\u6587\u672c\u989c\u8272\u53ca\u659c\u4f53<\/p>
\n<script>
\n\/\/\u7b2c\u4e00\u79cd
\n\/* var p1=document.getElementById(“p1”);
\np1.onclick=function(){
\nthis.style.color=’red’;
\nthis.style.fontStyle=’italic’;
\n} *\/
\n\/\/\u7b2c\u4e8c\u79cd
\nfunction changes(obj){
\nobj.style.color=’blue’;
\nobj.style.fontStyle=’italic’;
\n}
\n<\/script>
\n\"\"
\n\"\"<\/p>\n
EventListener\u76d1\u542c\u4e8b\u4ef6<\/strong><\/span><\/p>\n
\u65b9\u6cd5\uff1aaddEventListener()<\/p>\n
<div id=”div1″>
\n<p id=”p1″>\u8fd9\u662f\u6587\u672c<\/p>
\n<\/div>
\n<style>
\n#div1{width: 200px;height: 200px;background-color: bisque;}
\n#p1{text-align: center;padding-top: 50px;background-color: aqua;}
\n<\/style>
\n<script>
\nvar div1=document.getElementById(“div1”);
\ndiv1.addEventListener(“click”,function(){alert(“\u60a8\u70b9\u51fb\u4e86DIV”)},true);<\/p>\n
var p1=document.getElementById(“p1”);
\np1.addEventListener(“click”,function(){alert(“\u60a8\u70b9\u51fb\u4e86\u6587\u672c”)},false);
\n<\/script><\/p>\n
\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"
2020javaweb\u6559\u7a0b\u4e4bJavaScript\u7684DOM2 DOM\u6982\u8ff0\uff1a \u901a\u8fc7 HTML DOM,\u4f7f\u7528 Jav […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2482","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2482","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2482"}],"version-history":[{"count":1,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2482\/revisions"}],"predecessor-version":[{"id":2483,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2482\/revisions\/2483"}],"wp:attachment":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2482"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2482"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}