html登录页面验证码代码怎么写,js实现登录验证码

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Js代码:

/**

* 验证码

*/

function yzm(){

var codeChars = new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9,

‘a’,’b’,’c’,’d’,’e’,’f’,’g’,’h’,’i’,’j’,’k’,’l’,’m’,’n’,’o’,’p’,’q’,’r’,’s’,’t’,’u’,’v’,’w’,’x’,’y’,’z’,

‘A’, ‘B’, ‘C’, ‘D’, ‘E’, ‘F’, ‘G’, ‘H’, ‘I’, ‘J’, ‘K’, ‘L’, ‘M’, ‘N’, ‘O’, ‘P’, ‘Q’, ‘R’, ‘S’, ‘T’, ‘U’, ‘V’, ‘W’, ‘X’, ‘Y’, ‘Z’);

var code=””;

for(var i = 0;i < 4;i++)

{

var charNum = Math.floor(Math.random() * 52);

code += codeChars[charNum];

}

document.getElementById(“yzphoto”).value=code;

document.getElementById(“yzm”).value=code;

}

HTML代码:

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