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Detailed example of how to write browser gradient background color using css3

小云云Original: 2017-12-22 15:21:041732browse

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(&#39;wrap&#39;);
        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=&#39;#&#39;+convert(color[0])+&#39;&#39;+convert(color[1])+&#39;&#39;+convert(color[2])+&#39;&#39;;
            colorR=&#39;#&#39;+convert(color[2])+&#39;&#39;+convert(color[0])+&#39;&#39;+convert(color[1])+&#39;&#39;;
                    
                }
                gColor(colorL,colorR);
            }
        
        function convert(sRgb){ /*rgb转换成HEX*/
            var sRgb=sRgb;
            var sHex=sRgb.toString(16);
            sHex=sHex.length<2?&#39;0&#39;+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=&#39;-webkit-linear-gradient(left,&#39;+colorL+&#39;,&#39;+colorR+&#39;)&#39; //谷歌
                oWrap.style.background=&#39;-ms-linear-gradient(left,&#39;+colorL+&#39;,&#39;+colorR+&#39;)&#39;  //ie 10 11
            }
         
        
        }
    })();
        
</script>
</body>
</html>

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