Javascript - 检查是否在5秒内按下了两次键 [英] Javascript - Check if key was pressed twice within 5 secs

问题描述

我想检查在5秒内是否按了两次Enter键并执行一些操作。
如何在给定时间内检查密钥是否被按下一次或两次并执行不同的操作。

I want to check if Enter key was pressed twice within 5 secs and perform some action. How can I check if the key was pressed once or twice within a given time and perform different actions.

这是我的代码：

<h1 id="log">0</h1>
<br/>
<span id="enteredTime">0</span>

<script>
$(document).keypress(function(e) {
    if(e.which == 13){
        var element = $("#log");
        var timeDifference = 0;

        //Log the timestamp after pressing Enter
        $("#enteredTime").text(new Date().getTime());

        //Check if enter was pressed earlier
        if ($("#enteredTime").text() !== "0") {
            var now = new Date().getTime();
            var previous = $("#enteredTime").text();
            difference = now - previous;
        }
        //Check if enter was pressed only once within 5 secs or more
        if(){
            $("#log").text("Once");
            $("#enteredTime").text("0");
        //Check if enter was pressed twice in 5 secs
        }else{
             $("#log").text("Twice in less than 5 secs");
             $("#enteredTime").text("0");
        }

    }

});
</script>

http://jsfiddle.net/Rjr4g/

谢谢！

推荐答案

类似

var start=0;
$(document).keyup(function(e) {
    if(e.keyCode == 13) {
        elapsed = new Date().getTime();
        if(elapsed-start<=5000){
           //do something;
        }
        else{
            //do something else;
        }
        start=elapsed;
    }


});

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