css3 implementation of browser background gradient method code

This article mainly introduces to you the method of writing browser background gradient background color in CSS3. We will share with you the code for implementing this gradient background, hoping to help you.

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.

css code:

  <style>
    *{margin:0;padding:0;}
    body#wrap{width:100%;height:500px;
}
  </style>

javascript code:

##

    <script>
        (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>

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