Native js implements fadein and fadeout effect_javascript skills

Function attributes for setting the transparency of DOM nodes in js: filter= "alpha(opacity=" value ")" (compatible with IE) and opacity=value/100 (compatible with FF and GG).

Let’s first look at the compatibility code for setting transparency:

Copy the code The code is as follows:

function setOpacity(ele, opacity) {
if (ele.style.opacity != undefined) {
///Compatible with FF, GG and new version IE
ele.style.opacity = opacity / 100;

} else {
///Compatible with older versions ie
ele.style.filter = "alpha(opacity=" opacity ")";
}
}

Some friends write like this:

Copy the code The code is as follows:

function setOpacity(ele, opacity) {
if (document.all) {
///Compatible with ie
ele.style.filter = "alpha(opacity=" opacity " )";
}
ele {
///Compatible with FF and GG
ele.style.opacity = opacity / 100;
}
}

I want to say that there is a problem when running under IE10. There is no response after clicking. Because IE10 supports the opacity attribute but not filter, this method is not advisable.

fadein function code:

Copy code The code is as follows:

function fadein (ele, opacity, speed) {
if (ele) {
var v = ele.style.filter.replace("alpha(opacity=", "").replace(")", "") || ele.style.opacity;
v < 1 && (v = v * 100);
var count = speed / 1000;
var avg = count < 2 ? (opacity / count) : (opacity / count - 1);
var timer = null;
timer = setInterval(function() {
if (v < opacity) {
v = avg;
setOpacity (ele, v);
} else {
clearInterval(timer);
}
}, 500);
}
}

fadeout Function code:

Copy code The code is as follows:

function fadeout(ele, opacity, speed) {
if (ele) {
var v = ele.style.filter.replace("alpha(opacity=", "").replace(")", "") || ele.style.opacity || 100;
v < 1 && (v = v * 100);
var count = speed / 1000;
var avg = (100 - opacity) / count;
var timer = null;
timer = setInterval(function() {
if (v - avg > opacity) {
v -= avg;
setOpacity(ele, v);
} else {
clearInterval(timer);
}
}, 500);
}
}

The following is a demo example:

Copy code The code is as follows:

If you have any better implementation, please leave a message. . .