挑出來。感謝所有幫助我的人，當(dāng) id 屬性丟失時（或者由于某種原因不允許調(diào)用單個元素時），如何在頁面上的多個 DIV 元素上調(diào)用 JavaScript 代碼。我希望能夠通過更改背景顏色（內(nèi)容）和h 標(biāo)簽的顏色（單擊的位置）來對每個元素執(zhí)行某些操作，但我不想單獨(dú)訪問每個元素。Object.entries('.Container').map(( object ) => { object[1].addEventListener("click", function() { // Output innerHTML of the clicked element console.log("Hello " + this + " (" + this.innerHTML + ") from map method..."); }); }); body { background-color: rgba(255, 255, 255, 1); margin: 0px; padding: 0px; height: 100vh; width: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; overflow: hidden; } .Container { background-color: lightgray; margin: 0; padding: 0; height: auto; width: 250px; display: flex; flex-direction: column; align-items: center; justify-content: center; overflow: hidden; } .content { background-color: lightcyan; margin: 5px; padding: 0; height: auto; width: 80%; display: flex; flex-direction: row; align-items: center; justify-content: center; overflow: hidden; } h3 { color: red; } <div class="Container"> <div class ="content"><h3>content 1</h3></div> <div class ="content"><h3>content 2</h3></div> <div class ="content"><h3>content 3</h3></div> </div>
2 回答
繁星coding
TA貢獻(xiàn)1797條經(jīng)驗(yàn) 獲得超4個贊
您可以使用查詢字符串.container > .content來匹配類名稱為類content名稱為 的元素的子元素的元素container：
for (const content of document.querySelectorAll('.Container > .content')) {
content.addEventListener('click', (e) => {
content.style.backgroundColor = 'yellow';
content.children[0].textContent = 'changed text';
console.log("Hello " + content.outerHTML + ")...");
});
}
body {
background-color: rgba(255, 255, 255, 1);
margin: 0px;
padding: 0px;
height: 100vh;
width: 100%;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
overflow: hidden;
}
.Container {
background-color: lightgray;
margin: 0;
padding: 0;
height: auto;
width: 250px;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
overflow: hidden;
}
.content {
background-color: lightcyan;
margin: 5px;
padding: 0;
height: auto;
width: 80%;
display: flex;
flex-direction: row;
align-items: center;
justify-content: center;
overflow: hidden;
}
h3 {
color: red;
}
<div class="Container">
<div class="content">
<h3>content 1</h3>
</div>
<div class="content">
<h3>content 2</h3>
</div>
<div class="content">
<h3>content 3</h3>
</div>
</div>
另請注意，.map僅應(yīng)用于構(gòu)造新數(shù)組。如果您不打算構(gòu)造新數(shù)組，請使用其他數(shù)組。對于副作用（例如附加偵聽器），請使用forEach或for循環(huán)。
慕仙森
TA貢獻(xiàn)1827條經(jīng)驗(yàn) 獲得超8個贊
的參數(shù)Object.entries()必須是一個對象，而不是字符串。您想要的是document.querySelectorAll()，它返回與選擇器匹配的所有元素的列表。由于您想要單擊<h3>按鈕，因此需要擴(kuò)展選擇器以匹配它們。
您還應(yīng)該使用forEach()而不是map(). map()當(dāng)您想要返回包含在原始數(shù)組上調(diào)用函數(shù)的結(jié)果的新數(shù)組時使用。如果您只想對數(shù)組元素執(zhí)行操作，則不需要返回新數(shù)組。
document.querySelectorAll('.Container > .content > h3').forEach((element) => {
element.addEventListener("click", function() {
// Output innerHTML of the clicked element
console.log("Hello " + this.innerHTML);
});
});
body {
background-color: rgba(255, 255, 255, 1);
margin: 0px;
padding: 0px;
height: 100vh;
width: 100%;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
overflow: hidden;
}
.Container {
background-color: lightgray;
margin: 0;
padding: 0;
height: auto;
width: 250px;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
overflow: hidden;
}
.content {
background-color: lightcyan;
margin: 5px;
padding: 0;
height: auto;
width: 80%;
display: flex;
flex-direction: row;
align-items: center;
justify-content: center;
overflow: hidden;
}
h3 {
color: red;
}
<div class="Container">
<div class="content">
<h3>content 1</h3>
</div>
<div class="content">
<h3>content 2</h3>
</div>
<div class="content">
<h3>content 3</h3>
</div>
</div>
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