jQuery's .each() in javascript
jQuery's .each() in javascript
做这样的事情的替代方法是什么
$(".myElement").each(function(){
//function
});
用简单的Javascript?
这将迭代当前文档中的所有div
。你可以替换document.getElementsByClassName('someclass')
等,并用它们的attributes
和values
做一些事情
var elements = document.getElementsByTagName('div');
for (var i = 0; i < elements.length; i++) {
doSomething(elements[i]);
}
这是jsfiddle:http://jsfiddle.net/allenski/p7w5btLa/
$(#myElement)
您正在尝试对id
选择器进行迭代ID在HTML页面中必须是唯一的。
如果是要迭代的class or element
标记,则可以使用for
循环。
var $elems = $('.someClass');
for(var i=0; i< $elems.length; i++ ) {
// $elems[i] --> Gives you a `DOM` element
// $elems.eq(i) --> Gives you a `jQuery` object
}
香草Javascript
var elems = document.getElementsByClassName('someClass');
for(var i=0;i< elems.length;i ++) {
elem[i] // Based on index
}
getElementsByTagName
,如果您想在特定标签上进行迭代。
getElementsByName
-根据name属性获取元素。
您还可以使用document.querySelectorAll
来获取对象列表并对其进行迭代。
var elems = document.querySelectorAll('.someClass')
for(var i=0; i<elems.length; i++) {
elems[i] // Give you DOM object
}
每个函数的替代方法有两种:
设置
var $all = $('*');
var len = $all.length;
1
while(--len){
// use $($all[len]); for jQuery obj
var elem = $all[len];
doWork(elem);
}
2
//reset len for next loop
len = $all.length;
do {
var $elem = $all.filter(':eq('+ --len + ')');
doWork($elem);
} while (len);
var el = $(something);
for (var i = 0; i < el.length; i++) {
// do something with el[i] or more often with $(el[i])
}
el
是伪数组(或类似数组的Object),其具有length
和在范围0...length-1
中可由[]
运算符访问的元素。所以你可以做el[0]
、el[1]
等,但请记住,el
元素不是jquery"对象",通常它们是DOM元素,所以你不能做el[0].text("Hello")
。与each
方法一样,您必须执行$(el[0]).text("Hello");
这样做甚至是错误的:
for (var i = 0; i < $(something).length; i++) {
// do something with el[i] or more often with $(el[i])
}
因为以这种方式CCD_ 21将在每个周期被重新计算。
您必须使用for循环。看看http://www.w3schools.com/js/js_loop_for.asp
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