javascript some()函数用法详解

<script language="JavaScript" type="text/javascript">
if (!Array.prototype.some)
{
    Array.prototype.some = function(fun /, thisp/)
    {
        var len = this.length;
        if (typeof fun != "function")
            throw new TypeError();
        var thisp = arguments[1];
        for (var i = 0; i < len; i++)
        {
            if (i in this && fun.call(thisp, this[i], i, this))
                return true;
        }
        return false;
    };
}
</script>

<script language="JavaScript" type="text/javascript">
if(!Array.prototype.some)
{
Array.prototype.some=function(fun)
{
var len=this.length;
if(typeof fun!="function")
throw new TypeError();
var thisp=arguments[1];for(var i=0;i<len;i++)
{
if(i in this&&fun.call(thisp,this[i],i,this))
return true;}
return false;};
}
function isBigEnough(element,index,array){return(element>=10);}
var passed=[2,5,8,1,4].some(isBigEnough);
document.writeln("[2, 5, 8, 1, 4].some(isBigEnough) <strong>");
document.writeln(passed?'true':'false');
document.writeln("</strong><br />");
passed=[12,5,8,1,4].some(isBigEnough);
document.writeln("[12, 5, 8, 1, 4].some(isBigEnough) <strong>");
document.writeln(passed?'true':'false');
document.writeln("</strong><br />");
</script>
function isBigEnough(element, index, array) {
 return (element >= 10);
}
var passed = [2, 5, 8, 1, 4].some(isBigEnough);
// passed is false
passed = [12, 5, 8, 1, 4].some(isBigEnough);
// passed is true