jQuery .each()索引？
jQuery .each()索引？
提问于 2010-12-03 10:37:39
我正在使用
$('#list option').each(function(){
//do stuff
});循环遍历列表中的选项。我想知道怎样才能得到当前循环的索引？
因为我不想让var i= 0；在循环中有i++；
回答 5
Stack Overflow用户
回答已采纳
发布于 2010-12-03 10:39:18
$('#list option').each(function(index){
//do stuff
console.log(index);
});记录索引:)
下面是一个更详细的示例。
function run_each() {
var $results = $(".results");
$results.empty();
$results.append("==================== START 1st each ====================");
console.log("==================== START 1st each ====================");
$('#my_select option').each(function(index, value) {
$results.append("<br>");
// log the index
$results.append("index: " + index);
$results.append("<br>");
console.log("index: " + index);
// logs the element
// $results.append(value); this would actually remove the element
$results.append("<br>");
console.log(value);
// logs element property
$results.append(value.innerHTML);
$results.append("<br>");
console.log(value.innerHTML);
// logs element property
$results.append(this.text);
$results.append("<br>");
console.log(this.text);
// jquery
$results.append($(this).text());
$results.append("<br>");
console.log($(this).text());
// BEGIN just to see what would happen if nesting an .each within an .each
$('p').each(function(index) {
$results.append("==================== nested each");
$results.append("<br>");
$results.append("nested each index: " + index);
$results.append("<br>");
console.log(index);
});
// END just to see what would happen if nesting an .each within an .each
});
$results.append("<br>");
$results.append("==================== START 2nd each ====================");
console.log("");
console.log("==================== START 2nd each ====================");
$('ul li').each(function(index, value) {
$results.append("<br>");
// log the index
$results.append("index: " + index);
$results.append("<br>");
console.log(index);
// logs the element
// $results.append(value); this would actually remove the element
$results.append("<br>");
console.log(value);
// logs element property
$results.append(value.innerHTML);
$results.append("<br>");
console.log(value.innerHTML);
// logs element property
$results.append(this.innerHTML);
$results.append("<br>");
console.log(this.innerHTML);
// jquery
$results.append($(this).text());
$results.append("<br>");
console.log($(this).text());
});
}
$(document).on("click", ".clicker", function() {
run_each();
});.results {
background: #000;
height: 150px;
overflow: auto;
color: lime;
font-family: arial;
padding: 20px;
}
.container {
display: flex;
}
.one,
.two,
.three {
width: 33.3%;
}
.one {
background: yellow;
text-align: center;
}
.two {
background: pink;
}
.three {
background: darkgray;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container">
<div class="one">
<select id="my_select">
<option>apple</option>
<option>orange</option>
<option>pear</option>
</select>
</div>
<div class="two">
<ul id="my_list">
<li>canada</li>
<li>america</li>
<li>france</li>
</ul>
</div>
<div class="three">
<p>do</p>
<p>re</p>
<p>me</p>
</div>
</div>
<button class="clicker">run_each()</button>
<div class="results">
</div>
Stack Overflow用户
发布于 2010-12-03 10:39:33
jQuery会帮你解决这个问题。.each()回调函数的第一个参数是循环的当前迭代的索引。第二个是当前匹配的DOM元素，因此：
$('#list option').each(function(index, element){
alert("Iteration: " + index)
});Stack Overflow用户
发布于 2010-12-03 10:45:48
.each( function(index, Element) )
function(index, Element)A function to execute for each matched element.因此，您将希望使用：
$('#list option').each(function(i,e){
//do stuff
});...where索引将是索引，元素将是列表中的选项元素
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原文链接：
https://stackoverflow.com/questions/4341977
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