我有这段代码,允许您设置定时延迟的 CSS 更改。它工作得很好,只是它只允许你拥有一个实例,而我需要它允许多个实例。目前它只从循环中取出最后一个元素并保留超时功能。有没有办法让这个循环中的所有超时函数都被保存并运行?我认为这只是 setTimeout 函数每次都被重写,而不是一个独特的函数。
注意:我没有收到任何控制台错误
Javascript(在 onload 函数内)
elems = _('[data-timecss]'); //function to return elems via querySelectorAll()
for (var i=0; i<elems.length; i++) {
var tempelem = elems[i];
var c_info = elems[i].dataset.timecss.split(","); //split to get time
setTimeout(function() {
var css_e = c_info[1].split(";"); //split to get css properties
for (var c=0; c<css_e.length; c++) {
var css_elem = css_e[c].split(":"); //split property and value
tempelem.style.setProperty(css_elem[0], css_elem[1]); //set value
}
}, c_info[0]); //set time
}
HTML
<div class="block">
<p data-timecss="2000,color:green;font-weight:bold;">Change to green after 2000ms</p>
<p data-timecss="5000,display:none;">Hide this block after 5000ms</p>
</div>
无论哪个 data-timecss 是最后一个,都将正确运行。所以我可以看出超时函数每次都被覆盖。有谁知道如何让这些独一无二,同时又像我一样保持活力?
最佳答案
你需要关闭 - How do JavaScript closures work?
elems = _('[data-timecss]'); //function to return elems via querySelectorAll()
for (var i=0; i<elems.length; i++) {
(function(i) { // added this
var tempelem = elems[i];
var c_info = elems[i].dataset.timecss.split(","); //split to get time
setTimeout(function() {
var css_e = c_info[1].split(";"); //split to get css properties
for (var c=0; c<css_e.length; c++) {
var css_elem = css_e[c].split(":"); //split property and value
tempelem.style.setProperty(css_elem[0], css_elem[1]); //set value
}
}, c_info[0]); //set time
}(i)); // added this
}
关于JavaScript 不能在循环中使用多个 setTimeout 函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32567471/