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Detailed example of how to write browser gradient background color using css3
Detailed example of how to write browser gradient background color using css3
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>
</html>Related recommendations:
CSS3 gradient background color usage method is compatible with IE9+
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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