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    ڵλãҳ > ITɻ > webǰ > Webǰ˻֪ʶdomȡԪصķʽ

    无码人妻肉日韩精品>ַ:mxsty.ccm1x1s1t1y1-?   X

    ԭjsǻᾭdomṹͨȡǩв֪õjsȡԪصķʽЩ𣬲Щ֮ʲôأԼЩע!Ǿһһ°!

    JavaScriptȡԪصĵļַʽԼ

    (1) ͨIDȡgetElementById(“id”)

    ͨidǻȡʵʵһǩǾ̬ȡȡʱоͿԻȡõӸidıǩҲȡˡΪλ˵ͨidȡǾ̬ȡأͨ

    1. <ul id="list"></ul> 

    JsΪ

    1. var oUl = document.getElementById("list"); 
    2.    var byId = document.getElementById("h"); 
    3.    console.log(byId); 
    4.    //ulһli 
    5.    oUl.innerHTML = "<li id='h' style='width:100px;height:100px;background:red'></li>"
    6.    console.log(byId); 

    ĽΪnull null

    ԵóͨidĻȡǾ̬ȡںӵĻȡ

    ע⣺

    ١ıdocumentԭٽ;

    ڡͨidֻȡһԪأϾidǶһ޶;

    ۡͨidȡǾ̬ȡ;

    (2) ͨnameԻȡ getElementsByName('nameֵ')

    ǵıǩnameʱͨnameȡǩڵѡť

    1. <input type="radio" name='sex' >  
    2. <input type="radio" name='sex' checked>Ů 

    JsΪ

    1. var oSex = document.getElementsByName('sex'); 
    2. console.log(oSex); 

    ͼǽڵбΪһ飺

    ע⣺

    ١ıdocument;

    ڡȡĽһ飬һ飬lengthԣͨ±ȡӦԪ;

    (3) ͨǩȡgetElementsByTagName('ǩ')

    ͨǩȡԪһԪؼϣΪʽlength;ͨǩȡΪ̬ȡȡʱûиñǩֶӺҲܻȡ

    1. <ul id="list"></ul> 

    Js£

    1. var oUl = document.document.getElementById("list"); 
    2.     var byTagName = document.getElementsByTagName("li"); 
    3.     console.log(byTagName); 
    4.     //ulһli 
    5.     oUl.innerHTML = "<li id='h' style='width:100px;height:100px;background:red'></li>"
    6.     console.log(byTagName); 

    ĽΪ

    Կֶliǩ֮󣬿Զ̬ػȡ֮ıǩҲͨǩȡԪһϣֻһԪҲһϣһʽڣ顣

    ע⣺

    ١ĿdocumentҲһԪ;

    ڡһ飬гԣͨ[]Իȡijһ;

    ۡʹʱҪͨ±꣬ӵ¼ʱ;

    (4) ͨȡ getElementsByClassName(‘’)

    ͨȡԪصķʽ÷һҲǶ̬ȡ;

    ע⣺

    ١ĿdocumentҲһԪ;

    ڡһ飬гԣͨ[]Իȡijһ;

    ۡʹʱҪͨ±꣬ӵ¼ʱ;

    ܡעⵥƴдΪclassһؼ֣ΪgetElementsByClassName

    (5) ٻȡhtmlԪ document.documentElement

    1. documentһdocumentElementԣʼָHTMLҳе<html>Ԫء 
    2. var html = document.documentElement; //ȡö<html>   

    (6) ٻȡbodyԪ document.body

    1. document һ body ԣֱָ<body>Ԫء 
    2. var body = document.body; //ȡö<body> 

    (7) ͨѡȡһԪ querySelector("cssѡ")

    ÷һ CSS ѡģʽƥĵһԪء

    ע⣺

    ١ĿdocumentҲһԪ;

    ڡѡ“div .active”;

    ֵֻܻۡȡһԪ;

    ܡͨidȡķʽһΪ̬ȡ;

    ݡIe8´ڼ;

    (8) ͨѡȡһԪ querySelectorAll("cssѡ")

    ÷һ CSS ѡصƥԪضһԪءΪһڵб

    ע⣺

    ١ĿdocumentҲһԪ;

    ڡѡ“div .active”;

    ֵۡΪһڵбһ;

    ܡͨidȡķʽһΪ̬ȡ;

    ݡIe8´ڼ;

    ʹԭJSȡDOMԪص8ˣڽһΪʲôеķֻdocumentʹá

    divӣdivHTMLDivElementһʵdocumentHTMLDocument ʵ

    ǵļ̳йϵ

    HTMLDivElement > HTMLElement > Element > Node > EventTarget

    HTMLDocument > Document > Node > EventTarget

    Ƕ֪̳и࣬ͿʹøԺͷͬļ̳йϵNodeEventTargetҲ˵ǶʹNodeEventTargetϵķ

    NodeϵnodeNameparentNodeȣEventTargetϵaddEventListenerȡ

    getElementByIdֻDocumentԭϣHTMLDivElement ûм̳Document࣬divʹgetElementById

    getElementsByTagNameDocumentԭҲElementԭϣdivdocumentʹgetElementsByTagNameͬ

    ¡Webǰ˻֪ʶdomȡԪصķʽѰ

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