随机色&原生DOM筛选元素

function colorRandom1(){

var r = Math.floor(Math.random()*51+200);

var g = Math.floor(Math.random()*51+200);

var b = Math.floor(Math.random()*51+200);

return 'rgb('+r+','+g+','+b+')';

}

var div = document.body.getElementsByTagName('div')[0];

div.style.background = colorRandom();

div.setAttribute('style','color:'+colorRandom()+';background:'+colorRandom() );