Question

我有一个代码，可以根据我的真实值来创建和输出不同的变量。变量。真实=＆＃34;名称＆＃34;工作完美，但当我更新真相到＃34;电子邮件＆＃34;变量突然重复多次击键。任何帮助将不胜感激。

var cmd = "";
var cmd1 = "";
var truth = "name";
$(document).ready(function() {
    $("#contactlink a").click(function(){
        $(document).keyup(function(event){
            if (truth == "name"){
                if (event.which == 8){ //backspace deletes last character of string
                    cmd = cmd.substring(0, cmd.length - 1);
                }
                else if (event.which == 13){
                    var name = cmd;
                    $("#emailcontact").typed({
                        strings:["<br/><br/>Email Address: "],
                        typeSpeed: 10,
                        showCursor: false
                    }); 
                    truth = "email";
                }
                else if ((event.which >= 65 && event.which <= 90) || event.which == 32){
                    if (cmd.length == 0){
                        cmd = cmd + String.fromCharCode(event.which);
                    }
                    else if (cmd.substring(cmd.length-1,cmd.length) == " "){
                        cmd = cmd + String.fromCharCode(event.which);
                    }
                    else{
                    cmd = cmd + String.fromCharCode(event.which).toLowerCase();
                            }
                        }
                        $('#namecontact').text(cmd);
                    }
                    else if (truth == "email"){
                        if (event.which == 8){ //backspace deletes last character of string
                            cmd1 = cmd1.substring(0, cmd1.length - 1);
                        }
                        else if (event.which == 13){
                            var name = cmd1;
                            $("#emailcontact").typed({
                                strings:["<br/><br/>Email Address: "],
                                typeSpeed: 10,
                                showCursor: false
                            }); 
                            var cmd2;
                        }
                        else if ((event.which >= 65 && event.which <= 90) || event.which == 32){
                            cmd1 = cmd1 + String.fromCharCode(event.which).toLowerCase();
                        }
                        $('#emailcontact').append(cmd1);
                    }                       
                });
            });
        });

Answer 1

这是因为每次点击$(document).keyup(...)元素时，您都会添加新的#contactlink a侦听器。

为了防止你做这样的事情：

 $("#contactlink a").click(function(){
    $(document).off("keyup");
    $(document).on("keyup", function(event){
    });
 });

这样做是为了在再次添加之前删除先前添加的侦听器。

为什么我的javascript函数在一次击键时输出重复的字母？

1 个答案: