这是一个Four-Oh-Four.
hello world
")]),t._v("当作 HTML 标签解释。")]),t._v(" "),s("p",[t._v("如果页面已经解析完成（"),s("code",[t._v("DOMContentLoaded")]),t._v("事件发生之后），再调用"),s("code",[t._v("write")]),t._v("方法，它会先调用"),s("code",[t._v("open")]),t._v("方法，擦除当前文档所有内容，然后再写入。")]),t._v(" "),s("div",{staticClass:"language-js line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[t._v("document"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("addEventListener")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'DOMContentLoaded'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("function")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token parameter"}},[t._v("event")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n document"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("write")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'
Hello World!
')]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("var")]),t._v(" p "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" document"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("querySelector")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'p'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\np"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("id "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v('// "foo"')]),t._v("\n")])]),t._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[t._v("1")]),s("br"),s("span",{staticClass:"line-number"},[t._v("2")]),s("br"),s("span",{staticClass:"line-number"},[t._v("3")]),s("br")])]),s("p",[t._v("注意，"),s("code",[t._v("id")]),t._v("属性的值是"),s("strong",[t._v("大小写敏感")]),t._v("，即浏览器能正确识别"),s("code",[t._v('
')]),t._v("和"),s("code",[t._v('
')]),t._v("这两个元素的"),s("code",[t._v("id")]),t._v("属性，但是最好不要这样命名。")]),t._v(" "),s("h5",{attrs:{id:"_2-element-tagname-返回元素的大写标签"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_2-element-tagname-返回元素的大写标签"}},[t._v("#")]),t._v(" （2）Element.tagName 返回元素的大写标签")]),t._v(" "),s("p",[s("code",[t._v("Element.tagName")]),t._v("属性"),s("strong",[t._v("返回指定元素的大写标签名，与"),s("code",[t._v("nodeName")]),t._v("属性的值相等。")])]),t._v(" "),s("div",{staticClass:"language-js line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// HTML代码为")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v('// Hello')]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("var")]),t._v(" span "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" document"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("getElementById")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'myspan'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\nspan"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("id "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v('// "myspan"')]),t._v("\nspan"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("tagName "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v('// "SPAN"')]),t._v("\n")])]),t._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[t._v("1")]),s("br"),s("span",{staticClass:"line-number"},[t._v("2")]),s("br"),s("span",{staticClass:"line-number"},[t._v("3")]),s("br"),s("span",{staticClass:"line-number"},[t._v("4")]),s("br"),s("span",{staticClass:"line-number"},[t._v("5")]),s("br")])]),s("h5",{attrs:{id:"_3-element-dir-元素的文字方向-可读写-ltr、rtl"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_3-element-dir-元素的文字方向-可读写-ltr、rtl"}},[t._v("#")]),t._v(" （3）Element.dir 元素的文字方向，可读写（ltr、rtl）")]),t._v(" "),s("p",[s("code",[t._v("Element.dir")]),t._v("属性"),s("strong",[t._v("用于读写当前元素的文字方向")]),t._v("，可能是从左到右（"),s("code",[t._v('"ltr"')]),t._v("），也可能是从右到左（"),s("code",[t._v('"rtl"')]),t._v("）。")]),t._v(" "),s("h5",{attrs:{id:"_4-element-accesskey-分配给当前元素的快捷键-可读写"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_4-element-accesskey-分配给当前元素的快捷键-可读写"}},[t._v("#")]),t._v(" （4）Element.accessKey 分配给当前元素的快捷键，可读写")]),t._v(" "),s("p",[s("code",[t._v("Element.accessKey")]),t._v("属性"),s("strong",[t._v("用于读写分配给当前元素的快捷键")]),t._v("。")]),t._v(" "),s("div",{staticClass:"language-js line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// HTML 代码如下")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v('// 点击')]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("var")]),t._v(" btn "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" document"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("getElementById")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'btn'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\nbtn"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("accessKey "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v('// "h"')]),t._v("\n")])]),t._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[t._v("1")]),s("br"),s("span",{staticClass:"line-number"},[t._v("2")]),s("br"),s("span",{staticClass:"line-number"},[t._v("3")]),s("br"),s("span",{staticClass:"line-number"},[t._v("4")]),s("br")])]),s("p",[t._v("上面代码中，"),s("code",[t._v("btn")]),t._v("元素的快捷键是"),s("code",[t._v("h")]),t._v("，按下"),s("code",[t._v("Alt + h")]),t._v("就能将焦点转移到它上面。")]),t._v(" "),s("h5",{attrs:{id:"_5-element-draggable-当前元素是否可拖动-布尔值-可读写"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_5-element-draggable-当前元素是否可拖动-布尔值-可读写"}},[t._v("#")]),t._v(" （5）Element.draggable 当前元素是否可拖动，布尔值，可读写")]),t._v(" "),s("p",[s("code",[t._v("Element.draggable")]),t._v("属性"),s("strong",[t._v("返回一个布尔值，表示当前元素是否可拖动。该属性可读写。")])]),t._v(" "),s("div",{staticClass:"language-html line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-html"}},[s("code",[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("p")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("draggable")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("true"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("ondragstart")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("drag(this)"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("这是一段可移动的段落。"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("script")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),s("span",{pre:!0,attrs:{class:"token script"}},[s("span",{pre:!0,attrs:{class:"token language-javascript"}},[t._v("\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("function")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("drag")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token parameter"}},[t._v("el")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n console"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("log")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("el"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("draggable"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// true")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])]),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("")])]),t._v("\n")])]),t._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[t._v("1")]),s("br"),s("span",{staticClass:"line-number"},[t._v("2")]),s("br"),s("span",{staticClass:"line-number"},[t._v("3")]),s("br"),s("span",{staticClass:"line-number"},[t._v("4")]),s("br"),s("span",{staticClass:"line-number"},[t._v("5")]),s("br"),s("span",{staticClass:"line-number"},[t._v("6")]),s("br")])]),s("h5",{attrs:{id:"_6-element-lang-返回当前元素的语言设置-可读写"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_6-element-lang-返回当前元素的语言设置-可读写"}},[t._v("#")]),t._v(" （6）Element.lang 返回当前元素的语言设置，可读写")]),t._v(" "),s("p",[s("code",[t._v("Element.lang")]),t._v("属性"),s("strong",[t._v("返回当前元素的语言设置。该属性可读写。")])]),t._v(" "),s("div",{staticClass:"language-js line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// HTML 代码如下")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v('// ')]),t._v("\ndocument"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("documentElement"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("lang "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v('// "en"')]),t._v("\n")])]),t._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[t._v("1")]),s("br"),s("span",{staticClass:"line-number"},[t._v("2")]),s("br"),s("span",{staticClass:"line-number"},[t._v("3")]),s("br")])]),s("h5",{attrs:{id:"_7-element-tabindex-当前元素在-tab-键遍历时的顺序-整数-可读写"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_7-element-tabindex-当前元素在-tab-键遍历时的顺序-整数-可读写"}},[t._v("#")]),t._v(" （7）Element.tabIndex 当前元素在 Tab 键遍历时的顺序，整数，可读写")]),t._v(" "),s("p",[s("code",[t._v("Element.tabIndex")]),t._v("属性"),s("strong",[t._v("返回一个整数，表示当前元素在 Tab 键遍历时的顺序。该属性可读写。")])]),t._v(" "),s("p",[s("code",[t._v("tabIndex")]),t._v("属性值"),s("strong",[t._v("如果是负值（通常是"),s("code",[t._v("-1")]),t._v("），则 Tab 键不会遍历到该元素")]),t._v("。如果是正整数，则按照顺序，从小到大遍历。如果两个元素的"),s("code",[t._v("tabIndex")]),t._v("属性的正整数值相同，则按照出现的顺序遍历。遍历完所有"),s("code",[t._v("tabIndex")]),t._v("为正整数的元素以后，再遍历所有"),s("code",[t._v("tabIndex")]),t._v("等于"),s("code",[t._v("0")]),t._v("、或者属性值是非法值、或者没有"),s("code",[t._v("tabIndex")]),t._v("属性的元素，顺序为它们在网页中出现的顺序。")]),t._v(" "),s("h5",{attrs:{id:"_8-element-title-当前元素的-html-属性title-可读写"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_8-element-title-当前元素的-html-属性title-可读写"}},[t._v("#")]),t._v(" （8）Element.title 当前元素的 HTML 属性"),s("code",[t._v("title")]),t._v("，可读写")]),t._v(" "),s("p",[s("code",[t._v("Element.title")]),t._v("属性"),s("strong",[t._v("用来读写当前元素的 HTML 属性"),s("code",[t._v("title")]),t._v("。该属性通常用来指定，鼠标悬浮时弹出的文字提示框。")])]),t._v(" "),s("h4",{attrs:{id:"_1-2-元素状态的相关属性"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_1-2-元素状态的相关属性"}},[t._v("#")]),t._v(" 1.2 元素状态的相关属性")]),t._v(" "),s("h5",{attrs:{id:"_1-element-hidden-当前元素的hidden属性-控制是否可见-布尔值-可读写"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_1-element-hidden-当前元素的hidden属性-控制是否可见-布尔值-可读写"}},[t._v("#")]),t._v(" （1）Element.hidden 当前元素的hidden属性，控制是否可见，布尔值，可读写")]),t._v(" "),s("p",[s("code",[t._v("Element.hidden")]),t._v("属性"),s("strong",[t._v("返回一个布尔值，表示当前元素的"),s("code",[t._v("hidden")]),t._v("属性，用来控制当前元素是否可见。该属性可读写。")])]),t._v(" "),s("div",{staticClass:"language-js line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("var")]),t._v(" btn "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" document"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("getElementById")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'btn'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("var")]),t._v(" mydiv "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" document"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("getElementById")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'mydiv'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\nbtn"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("addEventListener")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v("'click'")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("function")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n mydiv"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("hidden "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("mydiv"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("hidden"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("false")]),s("span",{pre:!0,attrs:{class:"token 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"),s("h5",{attrs:{id:"_2-element-contenteditable元素内容的可编辑性-字符串-可读写"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_2-element-contenteditable元素内容的可编辑性-字符串-可读写"}},[t._v("#")]),t._v(" （2）Element.contentEditable元素内容的可编辑性，字符串，可读写，")]),t._v(" "),s("h5",{attrs:{id:"element-iscontenteditable-元素内容是否可编辑-布尔值-只读"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#element-iscontenteditable-元素内容是否可编辑-布尔值-只读"}},[t._v("#")]),t._v(" Element.isContentEditable 元素内容是否可编辑，布尔值，只读")]),t._v(" "),s("p",[t._v("HTML 元素可以设置"),s("code",[t._v("contentEditable")]),t._v("属性，使得元素的内容可以编辑。")]),t._v(" "),s("div",{staticClass:"language-html line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-html"}},[s("code",[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("div")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("contenteditable")]),s("span",{pre:!0,attrs:{class:"token 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5 > 3 < 6 &
Ethan blog 
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+