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Detailed example of how to write browser gradient background color using css3
- 小云云Original
- 2017-12-22 15:21:041775browse
This article mainly introduces the method of writing browser background gradient background color in CSS3. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.
The effect is as follows:
Knowledge points: rgb full color cycle algorithm, HEX and RGB color conversion algorithm, CSS3 color gradient, CSS3 gradient color compatible ie method , timers and loops, function encapsulation, array applications, etc.
Source code:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
<style>
*{margin:0;padding:0;}
body#wrap{width:100%;height:500px;
}
</style>
</head>
<body id="wrap">
<script>
/* RGB 色盘变化
// 1.rgb颜色的变化只有 ++ -- ；
// 2.什么时候发生改变
// 3.阈值和变化规律：
{
if(R==255&&G==0){B++;}
if(B==255&&G==0){R--;}
if(B==255&&R==0){G++;}
if(R==0&&G==255){B--;}
if(G==255&&B==0){R++;}
if(R==255&&B==0){G--;}
}
// 4.数据分析归类
{
if(G==255&&B==0){R++;}
if(B==255&&R==0){G++;}
if(R==255&&G==0){B++;}
if(G==0&&B==255){R--;}
if(B==0&&R==255){G--;}
if(R==0&&G==255){B--;}
}
// 5.解决方案转化成代码
{
R , G , B
var color=[R,G,B]
` color[0] //R
利用数组操作原本应该是3个变量的值
++ , --
}
*/
(function(){
var oWrap=document.getElementById('wrap');
var max=220; /*存储封值*/
var min=180; /*存储谷值*/
var color=[max,min,min]; /*根据初始值红色来初始化数组*/
var timer=null;
var length=color.length;
var colorL,colorR
timer=setInterval(change,20);
/*不容许在机组运行中直接修改代码*/
function change(){
/*在定时器中每过20毫秒 执行一次代码*/
/*检测一次数组*/
for(var i=0;i<length;i++){
i%=length;
var arrX=(i+1)%length;
var arrY=(i+2)%length;
if(color[i]==max&&color[arrX]==min){
color[arrY]++;
}
if(color[i]== min&&color[arrX]==max){
color[arrY]--;
}
colorL='#'+convert(color[0])+''+convert(color[1])+''+convert(color[2])+'';
colorR='#'+convert(color[2])+''+convert(color[0])+''+convert(color[1])+'';
}
gColor(colorL,colorR);
}
function convert(sRgb){ /*rgb转换成HEX*/
var sRgb=sRgb;
var sHex=sRgb.toString(16);
sHex=sHex.length<2?'0'+sHex:sHex
/* 三目判断 判断条件 ？ 符合条件 ：不符合条件*/
return sHex;
}
function gColor(colorL,colorR){
if(navigator.userAgent.match(/Trident/i)&&navigator.userAgent.match(/MSIE [7|8|9].0/i)){
//通过正则检测浏览器信息是否是ie 并且 ie版本是不是 7或者8或者9 之一
oWrap.style.filter = "progid:DXImageTransform.Microsoft.gradient( startColorstr=" + colorL + ", endColorstr=" + colorR + ",GradientType=0 )";
}else{
oWrap.style.background='-webkit-linear-gradient(left,'+colorL+','+colorR+')' //谷歌
oWrap.style.background='-ms-linear-gradient(left,'+colorL+','+colorR+')' //ie 10 11
}
}
})();
</script>
</body>
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JS method to achieve gradient background color when entering the page_javascript skills
Detailed explanation of how to make the background color gradient compatible with css
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