1 <!DOCTYPE html> 2 <html lang = "en"> 3 <head> 4 <meta charset = "UTF-8"> 5 <meta name = "viewport" content = "width = device-width、initial-scale = 1.0 "> 6 <title>ドキュメント</ title> 7 <style> 8 #box { 9 width:200px; 10 高さ:200px; 11 背景:赤; 12 } 13 </ style> 14 </ head> 15 <body> 16 <div id = "box"> </ div> box = document.getElementById( 'box' ) 19 box.onclick = function (){ 20 // 生成一个随机颜色 21 var str = '0123456789abcdef' 22 var color = '#' 23 for(var i = 0; i < 6; i ++ ){ 24 var index = Math.floor(Math.random()* str.length) 25 color + = str [index] 26 } 27 console.log(color) 29 box.style.background = color 30 } 31 </ script> 32 </ body> 33 </ html>