{"id":1182,"date":"2021-08-25T20:46:03","date_gmt":"2021-08-25T12:46:03","guid":{"rendered":"https:\/\/blog.odliken.top\/?p=1182"},"modified":"2023-08-12T17:23:30","modified_gmt":"2023-08-12T09:23:30","slug":"javascript%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/blog.odjbinail.cn\/?p=1182","title":{"rendered":"JavaScript\u5165\u95e8"},"content":{"rendered":"<h1>Js \u5165\u95e8\u30108.13\u300110.52\u3011<\/h1>\n<ul>\n<li>\n<p>\u662f\u4e00\u79cd\u811a\u672c\u8bed\u8a00\u3001\u76f4\u63a5\u5728\u9875\u9762\u4f7f\u7528 Js<\/p>\n<\/li>\n<li>\n<p>Js \u53d8\u91cf\uff1a\u4e0e\u5176\u4ed6\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u76f8\u540c\uff0c\u662f\u7528\u6765\u4e34\u65f6\u5b58\u50a8\u4fe1\u606f<\/p>\n<p>\u521b\u5efa\u65b9\u6cd5 1\uff1avar x=1; var x=2,name=&quot;zhangsan&quot;<\/p>\n<p>\u521b\u5efa\u65b9\u6cd5 2\uff1avar x; x=1;  \u3010\u5f31\u6570\u636e\u7c7b\u578b\u3011<\/p>\n<p>\u5c0f\u8d34\u58eb\uff1aJs \u4e2d\u7684\u53d8\u91cf\uff0c\u533a\u5206\u7c7b\u578b\uff0c\u4f46\u6ca1\u6709 int \u4e4b\u7c7b\u7684\u5173\u952e\u8bcd<\/p>\n<\/li>\n<li>\n<p>Js \u8c03\u8bd5\uff1aalert \u5f39\u6846\u8c03\u8bd5\u3001console.log \u63a7\u5236\u53f0\u8f93\u51fa\u8c03\u8bd5<\/p>\n<p>\u4f5c\u7528\uff1a\u89c2\u5bdf\u53d8\u91cf\u503c\u7684\u53d8\u5316\u89c4\u5f8b\uff0c\u662f\u5426\u7b26\u5408\u7a0b\u5e8f\u8bbe\u8ba1\u7684\u76ee\u7684<\/p>\n<p>\u793a\u4f8b\uff1aalert(flag);<\/p>\n<p>\u200b         consoLe.log(flag);<\/p>\n<p>\u5c0f\u8d34\u58eb\uff1a\u5148\u638c\u63e1\u719f\u7ec3\u8fd9\u4e24\u79cd\u65b9\u6cd5\uff0c\u518d\u5b66\u4e60\u5176\u4ed6\u8c03\u8bd5\u65b9\u6cd5<\/p>\n<\/li>\n<\/ul>\n<h3>\u81ea\u5b9a\u4e49\u51fd\u6570<\/h3>\n<ul>\n<li>\n<p>\u81ea\u5b9a\u4e49\u51fd\u6570\u662f\u5b8c\u6210\u67d0\u4e00\u529f\u80fd\u7684\u4ee3\u7801\u6bb5\uff0c\u53ef\u91cd\u590d\u6267\u884c\uff0c\u65b9\u4fbf\u7ba1\u7406\u548c\u7ef4\u62a4\u3002<\/p>\n<\/li>\n<li>\n<p>\u521b\u5efa\u65b9\u6cd5 1\uff1a\u8fd9\u79cd\u662f\u51fd\u6570\u58f0\u660e\u53ef\u4ee5\u5148\u4f7f\u7528\u540e\u5b9a\u4e49<\/p>\n<p>function fun1 ( ){<\/p>\n<p>\u4ee3\u7801\u7247\u6bb5<\/p>\n<p>return *** \uff1b}<\/p>\n<\/li>\n<li>\n<p>\u521b\u5efa\u65b9\u6cd5 2\uff1a\u8fd9\u79cd\u53eb\u505a\u51fd\u6570\u8868\u8fbe\u5f0f\u5fc5\u987b<strong><em>\u5148\u5b9a\u4e49\u540e\u4f7f\u7528<\/em><\/strong><\/p>\n<p>var fun1=function(x){<\/p>\n<p>return x+1; };<\/p>\n<\/li>\n<\/ul>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">  &lt;script type=&quot;text\/javascript&quot; src=&quot;index.js&quot;&gt;&lt;\/script&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\n\u3001\u3001.js\uff1a\n1\u3001\nfunction add(n1,n2){\n    var n3;\n    n3=n1+n2;\n    return n3;\n}\nvar num=add(13,14);\nconsole.log(num);\n2\u3001\nvar num1=function(n1,n2){\n    var n3=n1+n2;\n    return n3;\n}\n\/*alert(num1(13,14));*\/\nvar n=num1(14,14);\nalert(n);<\/code><\/pre>\n<h2>\u6570\u636e\u7c7b\u578b\u53ca\u8f6c\u6362<\/h2>\n<p>\u200b      number   string   boolean<\/p>\n<ul>\n<li>underfined \uff1a\u672a\u5b9a\u4e49\uff0c\u4e00\u822c\u6307\u7684\u662f\u5df2\u7ecf\u58f0\u660e\uff0c\u4f46\u662f\u6ca1\u6709\u8d4b\u503c\u7684\u53d8\u91cf<\/li>\n<li>null\uff1a\u7a7a\u5bf9\u8c61\u7c7b\u578b\uff0cvar a=null\uff0c\u548c var a=&quot;&quot;\u6709\u533a\u522b\uff1b<\/li>\n<li>\u7279\u6b8a\u7c7b\u578b\uff1aobject\u3001NaN<\/li>\n<li>object\uff1a\u5bf9\u8c61\u7c7b\u578b\uff0c\u5728 js \u5e38\u89c1\u7684\u6709 window,document,array \u7b49<\/li>\n<li>NaN\uff1a\u662f Number \u7684\u4e00\u79cd\u7279\u6b8a\u7c7b\u578b\uff0cisNaN() \uff0c\u5982\u679c\u662f\u6570\u5b57\u8fd4\u56de false\uff0c\u4e0d\u662f\u6570\u5b57\u8fd4\u56de true<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813152933704.png\"  alt=\"\" \/><\/li>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813152933704.png\" alt=\"\" \/><\/li><\/noscript>\n<\/ul>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">\/\/ var str=&quot;123&quot;;\n\/\/ console.log(str*1+1);\n\/\/ console.log(parseInt(str));\nvar str1=&quot;abc&quot;;\nif (!isNaN(str1)) {\n    console.log(parseInt(str1));\n}else{\n    console.log(&quot;is error&quot;);\n    str1=0;\n}\nconsole.log(str1);<\/code><\/pre>\n<ul>\n<li>\n<p>var str=0;        console.log(Boolean(str));  <\/p>\n<p>\u30100 \u662f false\u3001\u975e 0 \u662f true\u3011<\/p>\n<\/li>\n<li>\n<p>console.log(parseInt(str));<br \/>\nconsole.log(parseFloat(str));<br \/>\nconsole.log(Number(str));\/\/\u4f18\u5148<\/p>\n<\/li>\n<li>\n<p>var str=&quot;123&quot;;   \u3010123 \u3001123\u3001 123\u3011<\/p>\n<\/li>\n<li>\n<p>var str=&quot;abv&quot;;   \u3010NaN\u3001NaN\u3001NaN\u3011<\/p>\n<\/li>\n<li>\n<p>var str=&quot;123a&quot;;   \u3010123\u3001123\u3001NaN\u3011<\/p>\n<\/li>\n<li>\n<p>var str=&quot;a123&quot;;   \u3010NaN\u3001NaN\u3001NaN\u3011<\/p>\n<\/li>\n<li>\n<p>var str=&quot;0123&quot;;   \u3010123 \u3001123\u3001 123\u3011<\/p>\n<\/li>\n<li>\n<p>var str=&quot;0123.154&quot;;   \u3010123 \u3001123.154\u3001 123.154\u3011<\/p>\n<\/li>\n<li>\n<p>var str=&quot;&quot;;   \u3010NaN\u3001NaN\u3001 0\u3011    null \u4e00\u6837<\/p>\n<h2>\u53d8\u91cf\u4f5c\u7528\u57df<\/h2>\n<\/li>\n<li>\n<p>\u4f5c\u7528\u57df\uff1a\u5168\u5c40\u53d8\u91cf\u3001\u5c40\u90e8\u53d8\u91cf<\/p>\n<\/li>\n<li>\n<p>\u5c40\u90e8\u53d8\u91cf\uff1a\u5728\u51fd\u6570<strong>\u5185\u90e8<\/strong>\u521b\u5efa\u7684\u53d8\u91cf\uff0c\u79f0\u4e3a\u5c40\u90e8\u53d8\u91cf\uff0c\u5176\u4ed6\u51fd\u6570\u4e0d\u80fd\u4f7f\u7528\u3002<\/p>\n<\/li>\n<li>\n<p>\u5168\u5c40\u53d8\u91cf\uff1a\u5728\u51fd\u6570<strong>\u5916\u90e8<\/strong>\u521b\u5efa\u7684\u53d8\u91cf\uff0c\u79f0\u4e3a\u5168\u5c40\u53d8\u91cf\uff0c\u5728\u51fd\u6570\u4e4b\u95f4\u53ef\u4ee5\u5171\u4eab\u4f7f\u7528\u3002<\/p>\n<\/li>\n<\/ul>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">&lt;script type=&quot;text\/javascript&quot; src=&quot;index.js&quot;&gt;&lt;\/script&gt;\n&lt;\/head&gt;\nvar n=9;\nfunction fun1(){\n    var n1=5;\/\/\u5c40\u90e8\u53d8\u91cf\n    var n=12;\/\/\u5168\u5c40\u53d8\u91cf n\n    \/\/ console.log(n1);\n}\nfunction fun2(){\n    n=n-1;\n}\nfunction fun3(){\n    console.log(n);\n    console.log(n1);\n}\nfun1();\nfun2();\nfun3();<\/code><\/pre>\n<h2>\u8fd0\u7b97\u7b26<\/h2>\n<ul>\n<li>\n<p>\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff1a\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u503c\u3002\u7ed3\u679c\u662f true \u6216\u8005 false<\/p>\n<\/li>\n<li>\n<p>\u8fd0\u7b97\u7b26\u8303\u56f4\uff1a&gt;\u3001&gt;=\u3001!=\u3001&lt;\u3001&lt;=<\/p>\n<\/li>\n<li>\n<p>\u5b9e\u4f8b x&lt;10 \u4e3a true \/\/x=2<\/p>\n<\/li>\n<li>\n<p>\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813172001804.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813172001804.png\" alt=\"\" \/><\/p><\/noscript>\n<\/li>\n<li>\n<p>var x=2;<\/p>\n<p>var y=3;<\/p>\n<p>var flag=x&lt;10 &amp;&amp; y&lt;5;<\/p>\n<p>console.log(flag);   \/\/true<\/p>\n<\/li>\n<\/ul>\n<h2>\u7a0b\u5e8f\u63a7\u5236\u8bed\u53e5<\/h2>\n<ul>\n<li>\n<p>if else \u8bed\u53e5  x&gt;20.....<\/p>\n<\/li>\n<li>\n<p>\u591a\u6761\u4ef6\u63a7\u5236\u8bed\u53e5\uff1a\u6210\u7ee9\u5206\u5e03\u6bb5\uff0c\u4f18\u79c0\u6ee1\u5206<\/p>\n<\/li>\n<li>\n<p>\u5faa\u73af\u8bed\u53e5\uff1a1+2+3+4+5+.....+100=5050<\/p>\n<p>for  while  do...while   <\/p>\n<p>do{ sum=sum+i; i++;}while(i&lt;=100)<\/p>\n<\/li>\n<\/ul>\n<h2>\u5b57\u7b26\u51fd\u6570<\/h2>\n<p><img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813174428529.png\"  alt=\"\" \/><\/p>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813174428529.png\" alt=\"\" \/><\/p><\/noscript>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">var str=&quot;48234444444555554&quot;;\nconsole.log(str.substr(6,4));\/\/\u8d77\u59cb\u4f4d\u7f6e\uff0c\u957f\u5ea6\nconsole.log(str.substring(6,10));\/\/\u8d77\u59cb\u4f4d\u7f6e,\u7ed3\u675f\u4f4d\u7f6e\nvar n=parseInt(str.charAt(16))\nif(n%2==0){\nconsol.log(&quot;nv&quot;);\n}else{\nconsole.log(&quot;nan&quot;);\n}\nconsole.log(str.length);\/\/\u83b7\u53d6\u957f\u5ea6\nconsole.log(str.indexOf(1,4));\/\/\u622a\u53d6\u957f\u5ea6\n\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\nvar str=&quot;aa,ttt,121,gg,kk,aa,bb&quot;;\nvar arr=str.split(&quot;,&quot;);\nconsole.log(arr[0]);\nconsole.log(str.concat(&quot;,55&quot;,&quot;,77&quot;,&quot;,00&quot;));\nconsole.log(arr.concat(&quot;55&quot;,&quot;77&quot;,&quot;00&quot;));\/\/\u6570\u7ec4\u957f\u5ea6\u6269\u5927\nconsole.log(str.replace(&quot;aa&quot;,&quot;imooc&quot;))\/\/\u53ea\u66ff\u6362\u4e00\u4e2a<\/code><\/pre>\n<h2>\u65e5\u671f\u51fd\u6570<\/h2>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">var d1=new Date();\nvar d2=new Date(&quot;2022-1-1&quot;);\nconsole.log(d1.getDate());\nconsole.log(d1.getMonth()+1);\/\/\u4ece 0 \u5f00\u59cb\uff0c0-11\nconsole.log(d1.getFullYear());\nconsole.log(d1.getHours());\nconsole.log(d1.getMinutes());\nconsole.log(d1.getSeconds());\n\/\/\u8ddd\u79bb 2022-1-1 \u5143\u65e6\u591a\u5c11\u5929\nvar n=d2.getTime()-d1.getTime();\nconsole.log(parseInt(n\/(24*3600*1000)));\n\/\/2021-8-13 15:58 \u65e5\u671f\u683c\u5f0f\u5316\nfunction fun_FmtDate(){\n    var d1=new Date();\n    var yyyy,mm,dd,hh,mi,ss;\n    var time;\n    yyyy=d1.getFullYear();\n    mm=d1.getMonth()+1;\n    dd=d1.getDate();\n    hh=d1.getHours();\n    mi=d1.getMinutes();\n    ss=d1.getSeconds();\n    time=yyyy+&quot;-&quot;+mm+&quot;-&quot;+dd+&quot; &quot;+hh+&quot;:&quot;+mi+&quot;:&quot;+ss;\n    return time;\n}\nconsole.log(fun_FmtDate());<\/code><\/pre>\n<h2>\u6570\u5b66\u51fd\u6570<\/h2>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">var n=16.654364;\nconsole.log(Math.round(n));\/\/\u53d6\u6574\u6570\nconsole.log(n.toFixed(2));\/\/\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\nconsole.log(Math.min(2,6,81,1));\/\/\u6700\u5c0f\u503c\nconsole.log(Math.max(2,6,81,1));\/\/\u6700\u5927\u503c\nconsole.log(Math.abs(-3));\/\/\u6c42\u7edd\u5bf9\u503c<\/code><\/pre>\n<h2>\u6570\u7ec4<\/h2>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">\/\/ \/\/\u58f0\u660e\u6216\u521b\u5efa\u4e00\u4e2a\u4e0d\u6307\u5b9a\u957f\u5ea6\u7684\u6570\u7ec4\uff0c\u53c8\u79f0\u5b9e\u4f8b\u5316\u521b\u5efa;\n\/\/ var arrayObj=new Array();\n\/\/ \/\/\u58f0\u660e\u6216\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\u5e76\u6307\u5b9a\u957f\u5ea6\u7684\u6570\u7ec4:\n\/\/ var arrayObj=new Array(5);\n\/\/ \/\/\u58f0\u660e\u6216\u521b\u5efa\u4e00\u4e2a\u5e26\u6709\u9ed8\u8ba4\u503c\u7684\u6570\u7ec4:\n\/\/ var arrayObj=new Array(2,4,&quot;a&quot;,&quot;y&quot;,8);\n\/\/ \/\/\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\u5e76\u8d4b\u503c\u7684\u7b80\u5199\u00b7\u53c8\u79f0\u9690\u5f0f\u521b\u5efa\u6570\u636e\nvar arrayObj=[2,4,&quot;a&quot;,&quot;y&quot;,8,5,1];\n\/\/\u6570\u7ec4\u8d4b\u503c\u3001\u5b57\u7b26\u4e0b\u6807\u3001\u6570\u7ec4\u904d\u5386\nconsole.log(arrayObj[4]);\nfor(var str in arrayObj){\n    console.log(arrayObj[str]);\n}\/\/\u7528\u8fd9\u4e2a\uff0c\u5feb\uff0c\u65b9\u4fbf\n\/\/ var i=0;\n\/\/ var n=arrayObj.length;\n\/\/ for (i; i &lt;n; i++) {\n\/\/  console.log(arrayObj[i]);\n\/\/ }<\/code><\/pre>\n<h2>JS \u5bf9\u8868\u5355\u5143\u7d20\u8fdb\u884c\u8bbe\u7f6e<\/h2>\n<ul>\n<li>\n<p>\u8868\u5355\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u5728\u5ba2\u6237\u7aef\u63a5\u6536\u7528\u6237\u7684\u4fe1\u606f\uff0c\u7136\u540e\u5c06\u6570\u636e\u9012\u4ea4\u7ed9\u540e\u53f0\u7684\u7a0b\u5e8f\u6765\u64cd\u63a7\u8fd9\u4e9b\u6570\u636e<\/p>\n<\/li>\n<li>\n<p>JS \u505a\u4ec0\u4e48\uff1a\u8bbe\u7f6e\u6216\u83b7\u53d6\u5404\u79cd\u8868\u5355\u5143\u7d20\u7684\u503c<\/p>\n<\/li>\n<li>\n<p>\u793a\u4f8b\uff1a\u5229\u7528 js \u7ed9\u5217\u8868\u6846\u7b49\u8868\u5355\u5143\u7d20\u521d\u59cb\u5316<\/p>\n<\/li>\n<\/ul>\n<p>1\u3001\u7528\u6237\u540d\u6587\u672c\u6846<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">&lt;body onload=&quot;show1()&quot;&gt;&lt;!--\u9875\u9762\u52a0\u8f7d--&gt;\n    &lt;form&gt;\n        &lt;label&gt;\u7528\u6237\u540d&lt;\/label&gt;\n            &lt;input type=&quot;text&quot; id=&quot;userName&quot; name=&quot;userName&quot; value=&quot;123&quot;\/&gt;\n            &lt;input type=&quot;button&quot; id=&quot;btn&quot; onclick=&quot;show1()&quot; value=&quot;btn&quot;\/&gt;\n    &lt;\/form&gt;\n&lt;\/body&gt;\nfunction show1(){\n    \/\/alert(&quot;123456&quot;);    document.getElementById(&quot;userName&quot;).value=&quot;imooc&quot;;\n}<\/code><\/pre>\n<p>2\u3001\u5355\u9009\u6309\u94ae\u7528\u6cd5<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">&lt;form&gt;\n        &lt;label&gt;\u7528\u6237\u540d&lt;\/label&gt;\n            &lt;input type=&quot;text&quot; id=&quot;userName&quot; name=&quot;userName&quot; value=&quot;123&quot;\/&gt;&lt;br&gt;\n            &lt;input type=&quot;radio&quot; name=&quot;xb&quot; value=&quot;1&quot; checked=&quot;checked&quot;&gt;\u7537&lt;!--\u9ed8\u8ba4\u9009\u4e2d --&gt;\n            &lt;input type=&quot;radio&quot; name=&quot;xb&quot; value=&quot;0&quot;&gt;\u5973&lt;br&gt;\n            &lt;input type=&quot;button&quot; id=&quot;btn&quot; onclick=&quot;show1()&quot; value=&quot;btn&quot;\/&gt;\n    &lt;\/form&gt;\n&lt;\/body&gt;\nfunction show1(){\n    var xb=document.getElementsByName(&quot;xb&quot;);\n    var xbText;\n    if(xb[0].checked){\n        xbText=xb[0].value;\n    }else{\n        xbText=xb[1].value;\n    }\n    alert(xbText);\n}\n<\/code><\/pre>\n<p>3\u3001\u5217\u8868\u6846<\/p>\n<ul>\n<li>\u5e74\u6708\u65e5\u8054\u52a8<\/li>\n<\/ul>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">&lt;body onload=&quot;ymd()&quot;&gt;\n    &lt;form&gt;\n        &lt;select name=&quot;yyyy&quot; id=&quot;yyyy&quot; onchange=&quot;selectYmd()&quot;&gt;&lt;\/select&gt;\u5e74\n        &lt;select name=&quot;mm&quot; id=&quot;mm&quot; onchange=&quot;selectYmd()&quot;&gt;&lt;\/select&gt;\u6708\n        &lt;select name=&quot;dd&quot; id=&quot;dd&quot;&gt;&lt;\/select&gt;\u65e5\n        &lt;input type=&quot;button&quot; value=&quot;\u5220\u9664\u5217\u8868\u6846\u6761\u76ee&quot; onclick=&quot;deleteSelect()&quot; &gt;&lt;br&gt;\n        &lt;!--\u901a\u8fc7\u5e8f\u53f7\u6539\u53d8\u5934\u50cf--&gt;\n        &lt;img id=&quot;logoImg&quot; src=&quot;image\/toolbar\/1.png&quot;&gt;\n        &lt;select id=&quot;logo&quot; onchange=&quot;selectLogo()&quot;&gt;&lt;\/select&gt;\n    &lt;\/form&gt;\njs\uff1a\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\u3001\nfunction ymd(){\n    \/\/\u83b7\u53d6 id=yyyy \u7684\u63a7\u4ef6\u3010\u8868\u5355\u5143\u7d20\u3011\n    var yyyy=document.getElementById(&quot;yyyy&quot;);\n    var mm=document.getElementById(&quot;mm&quot;);\n    var dd=document.getElementById(&quot;dd&quot;);\n    \/\/\u52a8\u6001\u5e74\u4efd\u66f4\u65b0\n    var date=new Date();\n    var year=parseInt(date.getFullYear());\n    initSelect(yyyy,1999,year);\n    initSelect(mm,1,12);\n    initSelect(dd,1,31);\n    \/\/\u83b7\u53d6\u5217\u8868\u6846\u957f\u5ea6\n    var n=yyyy.length;\n    \/\/\u5217\u8868\u6846\u9009\u4e2d\u67d0\u4e00\u6761\u76ee\u3001\u9ed8\u8ba4\u5e74\u4efd\u4e2d\u95f4\u4f4d\u7f6e\n    yyyy.selectedIndex=Math.round(n\/2);\n}\n\/*g \u7ed9\u5217\u8868\u6846\u8d4b\u503c\uff0c\u4f20\u9012\u4e09\u4e2a\u53c2\u6570\uff1a\u8868\u5355\u5143\u7d20\uff0c\u5f00\u59cb\u503c\uff0c\u7ed3\u675f\u503c *\/\nfunction initSelect(obj,start,end){\n    for (var i = start; i&lt;=end; i++) {\n        obj.options.add(new Option(i,i));\n    }\n}\n\/\/\u52a8\u6001\u83b7\u53d6\u95f0\u6708\u3001\u95f0\u5e74\u7b49\u6708\u4efd\u5173\u7cfb\nfunction selectYmd(){\n    var yyyy=document.getElementById(&quot;yyyy&quot;);\n    var mm=document.getElementById(&quot;mm&quot;);\n    var dd=document.getElementById(&quot;dd&quot;);\n    var m=parseInt(mm.value);\n    var dayEnd;\n    if(m==4 || m==6 || m==9 || m==11){\n        dayEnd=30;\n    }else if(m==2){\n        dayEnd=28;\n        y=parseInt(yyyy.value);\n        if ((y%4==0&amp;&amp;y%100!=0) || y%400==0) {\n            dayEnd=29;\n        }\n    }else{\n        dayEnd=31;\n    }\n    \/\/\u5c06\u67d0\u4e2a\u5217\u8868\u6846\u7684\u6761\u76ee\u6570\u8bbe\u7f6e\u4e3a 0\uff0c\u6548\u679c\u4e3a\u5220\u9664\n    dd.options.length=0;\n    initSelect(dd,1,dayEnd);\n}\n\/\/\u5220\u9664\u5217\u8868\u6846\u7684\u67d0\u4e00\u4e2a\u6761\u76ee\u3002\u5373\uff1a\u6309\u7d22\u5f15\u53f7\u5220\u9664\nfunction deleteSelect(){\n    var dd=document.getElementById(&quot;dd&quot;);\n    for (i =  dd.length; i &gt;=0; i--) {\n         dd.options.remove(0);\/\/\u5168\u5220\u4e86\n    }\n}\n\/\/\u5b8c\u6210\u4f5c\u4e1a\uff1a\u7b2c\u4e00\u79cd\u5168\u5220\u3001\u5168\u52a0\uff0c\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u5b9e\u73b0\u5e74\u6708\u65e5\u7684\u4e09\u7ea7\u8054\u52a8\nfunction initLogo(){\n    var logo= document.getElementById(&quot;logo&quot;);\n    for(i=1;i&lt;=15;i++){\n        logo.options.add(new Option(i,i));\n    }\n}\nfunction selectLogo(){\n    var logo= document.getElementById(&quot;logo&quot;);\n    var n=logo.value;\n    \/\/ alert(n);\u3001\u6d4b\u8bd5\u3001F12\n    var logoImg=document.getElementById(&quot;logoImg&quot;);\n    logoImg.src=&quot;image\/toolbar\/&quot;+n+&quot;.png&quot;;\n}<\/code><\/pre>\n<p>4\u3001\u5168\u9009\u3001\u5168\u4e0d\u9009\u3001\u53cd\u9009\u3010\u590d\u9009\u6846\u3011<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-js\">&lt;body &gt;\n    &lt;form&gt;\n        &lt;input type=&quot;checkbox&quot; name=&quot;interest&quot; value=&quot;1&quot; \/&gt;&lt;label&gt;\u6e38\u6cf3&lt;\/label&gt;\n        &lt;input type=&quot;checkbox&quot; name=&quot;interest&quot; value=&quot;2&quot;\/&gt;&lt;label&gt;\u722c\u5c71&lt;\/label&gt;\n        &lt;input type=&quot;checkbox&quot; name=&quot;interest&quot; value=&quot;3&quot;\/&gt;&lt;label&gt;\u770b\u4e66&lt;\/label&gt;\n        &lt;input type=&quot;checkbox&quot; name=&quot;interest&quot; value=&quot;4&quot;\/&gt;&lt;label&gt;\u542c\u6b4c&lt;\/label&gt;\n        &lt;input type=&quot;button&quot; id=&quot;btn1&quot; value=&quot;\u5168\u9009&quot; onclick=&quot;checkInterest()&quot;&gt;\n        &lt;input type=&quot;button&quot; value=&quot;\u53cd\u9009&quot; onclick=&quot;checkInterest1()&quot; &gt;\n    &lt;\/form&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\nvar flag=true;\nfunction checkInterest(){\n    var interest=document.getElementsByName(&quot;interest&quot;);\n    for(i=0;i&lt;interest.length;i++){\n        interest[i].checked=flag;\n    }\n    if(flag){\n        document.getElementById(&quot;btn1&quot;).value=&quot;\u5168\u4e0d\u9009&quot;;\n    }else{\n        document.getElementById(&quot;btn1&quot;).value=&quot;\u5168\u9009&quot;;\n    }\n    flag=!flag;\/\/\u5f00\u5173\u53d8\u91cf\n}\nfunction checkInterest1(){\n    var interest=document.getElementsByName(&quot;interest&quot;);\n    for(i=0;i&lt;interest.length;i++){\n        interest[i].checked=!interest[i].checked;\n        \/\/ console.log(interest[i].value);\n    }\n}<\/code><\/pre>\n<h2>\u4e8b\u4ef6<\/h2>\n<ul>\n<li>\u4e8b\u4ef6\u662f\u6307\u88ab\u7a0b\u5e8f\u53d1\u73b0\u7684\u884c\u4e3a\u6216\u53d1\u751f\u7684\u4e8b\u60c5\uff0c\u800c\u4e14\u5b83\u53ef\u80fd\u4f1a\u88ab\u7a0b\u5e8f\u5904\u7406<\/li>\n<li>\u7279\u70b9\uff1ajs \u7684\u4e8b\u4ef6\uff0c\u90fd\u662f\u4ee5 on \u5f00\u5934\uff0c\u6709 onclick\u3001onchange\u3001onload...<\/li>\n<li>\u5206\u7c7b\uff1a\u952e\u76d8\u4e8b\u4ef6\u3001\u9f20\u6807\u4e8b\u4ef6\u3001\u8868\u5355\u4e8b\u4ef6....<br \/>\n<img data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813233720356.png\"  alt=\"\" \/><\/li>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813233720356.png\" alt=\"\" \/><\/li><\/noscript>\n<li>DOM\u3010Document Object 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data-original=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813234029631.png\"  alt=\"\" \/><\/li>\n<noscript><img decoding=\"async\" src=\"https:\/\/blog.odjbinail.cn\/wp-content\/uploads\/2021\/08\/image-20210813234029631.png\" alt=\"\" \/><\/li><\/noscript>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Js \u5165\u95e8\u30108.13\u300110.52\u3011 \u662f\u4e00\u79cd\u811a\u672c\u8bed\u8a00\u3001\u76f4\u63a5\u5728\u9875\u9762\u4f7f\u7528 Js Js \u53d8\u91cf\uff1a\u4e0e\u5176\u4ed6\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u76f8\u540c\uff0c 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