Javascript - 检查按键是否在 5 秒内被按下两次

Question

我想检查是否在 5 秒内按了两次 Enter 键并执行某些操作。 如何检查在给定时间内按键是否被按下一次或两次并执行不同的操作。

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!

Answer 1

类似的东西

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;
    }


});