javascript - A number is incremented by 1 every second and printed out until it reaches 50. How to implement this using js?

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Release: 2016-10-17 09:30:09
Original
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As in the question, how to solve the problem using closure and setTimeout function?
PHP implementation is also welcome

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As in the question, how to solve the problem using closure and setTimeout function?
PHP implementation is also welcome

<code>var count = (function() {
    var timer;
    var i = 0;
    function change(tar) {
        i++;
        console.log(i);
        if (i === tar) {
            clearTimeout(timer);
            return false;
        }
        timer = setTimeout(function() {
            change(tar)
        }, 1000)

    }
    return change;
})()

count(50)</code>
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<code>(function(){
    var i=0;
    var end=setInterval(function(){
        if(i>=50){
            clearInterval(end);
        }
        console.log(i);
        i++;
    },1000);
})()</code>
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If you use setTimeout, there is no need to clear.

<code>void function loop(i) {
    if (i <= 50) {
        console.log(i);
        setTimeout(loop.bind(this, ++i), 1000);
    }
}(1);</code>
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It seems that closure is not used, so let’s do this:

<code>void function loop(i) {
    if (i <= 50) {
        console.log(i);
        setTimeout(function() {loop(++i);}, 1000);
    }
}(1);</code>
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OK, now we have closure.

function Count(){

<code>    var counter=0;
    function addCount(){
        counter++;
        console.log(counter);
        if(counter==50){
            return false;
        }
        setTimeout(addCount,1000);
    }
    return addCount;
}
var myCount=new Count();
myCount();</code>
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<code>var task = function (){
    var val = 0;
    var target = 50;
    
    (function add(){
        val++;
        if(val === target)
            return;
            
        setTimeout(add, 1000);    
    })();
}</code>
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You can’t stop this

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