闭包的生存周期

 var Type = {};
       
        for (var i = 0, type; type = [‘String‘, ‘Array‘, ‘Number‘][i++];) {
            (function (type) {
                Type[‘is‘ + type] = function (obj) {
                    return Object.prototype.toString.call(obj)===‘[object ‘+type+‘]‘;
                }
            })(type);
        }  
        console.log(Type.isArray([]));    //true
        console.log(Type.isString(234));  //false

 <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div> 
    
    <script type="text/javascript">
        var nodes = document.getElementsByTagName(‘div‘);
        for (var i = 0; i < nodes.length; i++) {
            nodes[i].onclick = function () {
                alert(i);
            } 
        }
    </script>

<div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div> 
    
    <script type="text/javascript">
        var nodes = document.getElementsByTagName(‘div‘);
        for (var i = 0; i < nodes.length; i++) {
            (function (i) {
                nodes[i].onclick = function () {
                    alert(i);
                }
            })(i);
        }
    </script>