1 <html lang="en"> 2 3 <head> 4 <meta charset="UTF-8"> 5 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 6 <meta http-equiv="X-UA-Compatible" content="ie=edge"> 7 <title>排他思想</title> 8 </head> 9 10 <body> 11 <button>按钮1</button> 12 <button>按钮2</button> 13 <button>按钮3</button> 14 <button>按钮4</button> 15 <button>按钮5</button> 16 <button>按钮6</button> 17 <script> 18 // this self 指针 19 window.onload = function() { 20 var btns = document.querySelectorAll("button"); 21 for (var i = 0; i < btns.length; i++) { 22 // btns[i].index = i 23 // btns[i].onclick = function() { 24 // alert("你点击" + this.index + "的几个按钮"); 25 // } 26 //用闭包来做也可以 27 (function(i) { 28 btns[i].onclick = function() { 29 alert("你点击" + i + "的几个按钮"); 30 } 31 })(i) 32 } 33 34 } 35 </script> 36 37 </body> 38 39 </html>