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louxiaojian's Issues

Code review request

Purpose of code changes on this branch:


When reviewing my code changes, please focus on:


After the review, I'll merge this branch into:
/trunk

Original issue reported on code.google.com by louxiaojian on 22 Sep 2009 at 10:06

Loop

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<title>Loop Benchmarks</title>
<style type="text/css">
    body{font-family:helvetica,arial,sans-serif;font-size:12px;}
    span{display:none;}
    table{border-collapse:collapse;margin:10px 0;}
    caption{text-align:left;font-size:18px;font-weight:bold;margin:10px 0;}
    td{padding:10px;border:2px solid #ccc;}
    td.bench{color:#c60;font-weight:normal;}
    td.code{font-family:"courier new",monospace;}
</style>
<script type="text/javascript">

var chars = '0123456789abcdef';

function getRandomString() {
    var len = Math.ceil(Math.random() * 7) + 3; // 4-10
    var result = "";
    while (len--) {
        result += chars.charAt(Math.floor(Math.random() * 
chars.length));
    }
    return result;
}

function esc(str) {
    str=str.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace
(/>/g,'&gt;');
    return str;
}

var forEachImp = 'native';
if (!Array.prototype.forEach) {
    forEachImp = 'custom';
    Array.prototype.forEach = 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); }
        }
    };
}

function test() {

    var isIE = window.ActiveXObject;
    var size = isIE ? 1000 : 10000;
    var mult = 100;

    var arr = [];
    var lsize = size;
    while (lsize--) { arr.push('' + getRandomString() + ''); }

    var
            start = {},
            end = {},
            comment = {},
            testDesc,
            result = "",
            n, i, len;

    //#########################################

    testDesc = "for (var i = 0; i < arr.length; i++) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (i = 0; i < arr.length; i++) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'Basic for loop.';

    //#########################################

    testDesc = "for (var i = 0, len = arr.length; i < len; i++) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (i = 0, len = arr.length; i < len; i++) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'For loop, but caching the length.';

    //#########################################

    testDesc = "for (var i = 0, len = arr.length; i < len; ++i) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (i = 0, len = arr.length; i < len; ++i) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'For loop, but caching the length. ++i';

    //#########################################

    testDesc = "for (var i = 0, len = arr.length; i < len; i += 1) 
{  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (i = 0, len = arr.length; i < len; i += 1) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'For loop, but caching the length. i += 1';

    //#########################################

    testDesc = "for (var i = 0, len = arr.length; i < len; i = i + 1) 
{  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (i = 0, len = arr.length; i < len; i = i + 1) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'For loop, but caching the length. i = i + 1';

    //#########################################

    testDesc = "var i = 0; while (i < arr.length) { i++; }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        i = 0; while (i < arr.length) { i++; }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'While loop that imitates a for loop.';

    //#########################################

    testDesc = "var i = 0, len = arr.length; while (i < len) { i++; }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        i = 0, len = arr.length; while (i < len) { i++; }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'While loop that imitates a for loop, caching 
the length.';

    //#########################################

    testDesc = "var i = arr.length; while (i--) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        i = arr.length; while (i--) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'While loop in reverse, simplifying the test 
condition.';

    //#########################################

    testDesc = "var i = arr.length - 1; do {  } while (i--);";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        i = arr.length - 1; do {  } while (i--);
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'do ... while loop in reverse.';

    //#########################################

    testDesc = "for (var i = arr.length; i--;) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (i = arr.length; i--;) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'for loop in reverse.';

    //#########################################

    var popArrs = [];
    for (n = 0; n < mult; n++) { popArrs.push(arr.slice()); }

    testDesc = "var x; while (x = arr.pop()) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        while (x = popArrs[n].pop()) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'While looping by popping values (this fails 
on sparse arrays).';

    //#########################################

    testDesc = "for (var i in arr) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (var x in arr) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'for ... in loop';


    //#########################################

    testDesc = "for (var i = 0; arr[i]; i++) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (i = 0; arr[i]; i++) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'For loop, testing on existence rather than 
length (this fails on sparse arrays).';

    //#########################################

    testDesc = "for (var i=0, x; x = arr[i++];) {  }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        for (i = 0, x; x = arr[i++];) {  }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'For loop, testing on existence rather than 
length, array lookup is combined with test.';

    //#########################################

    testDesc = "arr.forEach(function(x){});";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        arr.forEach(function(x){});
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'Array.forEach() ' + forEachImp + ' 
implementation.';

    //#########################################

    testDesc = "var f=function(x){}; for (var i = 0, len = arr.length; 
i < len; i++) { f(arr[i]); }";
    start[testDesc] = new Date().getTime();
    for(n = 0; n < mult; n++) {
        var f = function(x){};
        for (i = 0, len = arr.length; i < len; i++) { f(arr[i]); }
    }
    end[testDesc] = new Date().getTime();
    comment[testDesc] = 'For reference against forEach().';

    //#########################################

    result += '<table class="data">';
    result += '<caption>Native Array (length='+arr.length+', 
looped '+mult+' times)</caption>';
    for (testDesc in start) {
        result += '<tr>';
        result += '<td class="comment">'+comment[testDesc]+'</td>';
        result += '<td class="code">'+esc(testDesc)+'</td>';
        result += '<td class="bench">'+(end[testDesc] - start
[testDesc])+'ms</td>';
        result += '</tr>';
    }
    result += '</table>';

    if(isIE)
        result += '<p style="color: #f00">注意：你使用的是 IE, 数组大小是 
1000, 比其它浏览器小了 10 倍。</p>';

    //#########################################

    document.body.innerHTML += result;
    document.getElementById('h').firstChild.data = 'Done Testing.';
    document.getElementById('h').style.color='#060';
}

</script>

</head>
<body>
<h1 id="h" style="color:#c60">Testing...</h1>
<script type="text/javascript">
    setTimeout(test, 500);
</script>
</body>
</html>

Original issue reported on code.google.com by louxiaojian on 22 Sep 2009 at 10:26

offset.html

offset

Original issue reported on code.google.com by louxiaojian on 22 Sep 2009 at 10:07

offset

offset.html

Original issue reported on code.google.com by louxiaojian on 22 Sep 2009 at 10:08

Attachments:

offset.html

offset111111.html

offset.html

Original issue reported on code.google.com by louxiaojian on 22 Sep 2009 at 10:09

Attachments:

offset.html

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