From Javascript's Kiss

onload = function(){
    Watch.start("Store length");
    var p2 = document.getElementsByTagName("p");
    //第一次循環使用
    for (var i = 0, l = p2.length; i < l; i++) {
        p2[i].innerHTML = "Change again";
    }
    //第二次循環使用
    for (var i = 0, l = p2.length; i < l; i++) {
        p2[i].innerHTML = "Change again";
    }
    Watch.stop();
    
    Watch.start("Store to array");
    var p = document.getElementsByTagName("p");
    var arr = [];
    var c = null;
    //儲存進數組
	//注意這種循環的使用方式，下同
    for (var i = 0; c = p[i++];) {
        arr.push(c);
    }
    //第一次循環使用
    for (var i = 0; c = arr[i++];) {
        c.innerHTML = "Change backup."
    }
    //第二次循環使用
    for (var i = 0; c = arr[i++];) {
        c.innerHTML = "Change backup."
    }
    Watch.stop();
    //打印结果           
    Watch.report();
}

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