function bg3(){
//随机颜色
var r=Math.floor(Math.random()*256);
var g=Math.floor(Math.random()*256);
var b=Math.floor(Math.random()*256);
return "rgb("+r+','+g+','+b+")";//所有方法的拼接都可以用ES6新特性`其他字符串{$变量名}`替换
// //一定范围内随机颜色
// var min = 80;
// var max = 150;
// var r=rn(min,max);
// var g=rn(min,max);
// var b=rn(min,max);
// return "rgb("+r+','+g+','+b+")"
}
function rn(min,max) {
return Math.floor(Math.random()*(max-min)+min);
};
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js -- Random color display/specified range display
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