js中生成uuid的代码实现,可以配合图片验证码的校验

 generate_uuid:function () {
            var s = [];
            var hexDigits = "0123456789abcdef";
            for (var i = 0; i < 36; i++) {
                s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
            }
            s[14] = "4";  // bits 12-15 of the time_hi_and_version field to 0010
            s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1);  // bits 6-7 of the clock_seq_hi_and_reserved to 01
            s[8] = s[13] = s[18] = s[23] = "-";

            var uuid = s.join("");
            return uuid;

        },

function uuid() {  
    var s = [];  
    var hexDigits = "0123456789abcdef";  
    for (var i = 0; i < 36; i++) {  
        s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);  
    }  
    s[14] = "4";  // bits 12-15 of the time_hi_and_version field to 0010  
    s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1);  // bits 6-7 of the clock_seq_hi_and_reserved to 01  
    s[8] = s[13] = s[18] = s[23] = "-";  
   
    var uuid = s.join("");  
    return uuid;  
}  

这两种方法适合非常适合于配合图片验证码的校验进行使用，代码量极少，逻辑简单。

// 索取图片验证码方法
		generate_image_code: function () {
			// 生成uuid==image_code_id
			this.image_code_id = this.generate_uuid();
			// 拼接获取图片验证码的url，赋值给img标签的src属性
			this.image_code_url = 'http://127.0.0.1:8000' + '/image_codes/' + this.image_code_id + '/';
        },