js made random codes 8

　　Development ideas:

　　Draw placement verification code module, a written "see ..." pieces, and the codes of the input text box

　　Acquisition modules

　　A function package Yan_ma (), to set the authentication code 8, which contains digital, lowercase letters, lower case letters and Chinese. The possibility of occurrence of each type was 25%.

　　0-9 random numbers between. Of Math.ramand () it rounds down.

　　Case letters using the fromCharCode random () method: a character into Unicode encoding, for example:

　　var n = String.fromCharCode(65);

　　cosole.log(n);

　　A result is output // j

　　Uppercase letters (65-91) lowercase letters (97-123)

　　var s = String.fromCharCode(Math.floor(Math.random() * 26 + 65));

　　var s = String.fromCharCode(Math.floor(Math.random() * 26 + 97));

　　Random Chinese, declare a variable letter placed Chinese string, use charAt () to get a random letter in Chinese characters.

　　var letter = "executive sum Su Jian Yin life for you to do thousands of back then it Should be darling please promise me under the lamp in ink";

　　var s = letter.charAt(Math.floor(Math.random() * letter.length));

　　Codes provided to each random color, font size, text position relative rotational angle. Color function to a package, using a hexadecimal color (eg: #ffffff)

　　//random color

　　function fontcolor(){

　　var s1="";

　　for (var k = 0; k <6; k ++) {

　　var z=[0,1,2,3,4,5,6,7,8,9,"a","b","c","d","e","f"];

　　var m=z[Math.floor(Math.random() * z.length)];

　　s1 +=m;

　　} Wuxi abortion how much money http://mobile.bhnfkyy.com/

　　return "#"+s1;

　　}

　　The same random positions and random rotation angles Method

　　8px random positions may be shifted vertically and horizontally, may be random rotation angle around the z-axis (± 45 °).

　　An empty string str declare in advance so that each code string connected.

　　var s = String.fromCharCode(Math.floor(Math.random() * 26 + 97));

　　str+=""+s+"";

　　arr+=s;

　　Let 8 innerHTML code appears in the first large module in.

　　To read, "see" the span tag to add a click event, when clicked, call the function Yan_ma, refresh verification codes.

　　If you enter a verification code is not correct, then the pop-up "verification success", or pop-up "Authentication failed."

　　See ...

　　verification