| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>Chapter reflow performance test: random text</title> |
| <script src="../resources/runner.js"></script> |
| </head> |
| <body> |
| <pre id="log"></pre> |
| <div id="target" style="width: 300px; display: none;"> |
| |
| </div> |
| <script> |
| var RandomTextGenerator = function() { |
| this.letters = [ |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode), |
| String.fromCharCode(RandomTextGenerator.firstCharCode) |
| ] |
| } |
| |
| RandomTextGenerator.firstCharCode = 65; // 'A' |
| |
| RandomTextGenerator.lastCharCode = 123; // 'z' |
| |
| RandomTextGenerator.prototype.advance = function(index) { |
| var charCode = this.letters[index].charCodeAt(0); |
| var newCharCode = charCode + 1; |
| if (newCharCode > RandomTextGenerator.lastCharCode) |
| newCharCode = RandomTextGenerator.firstCharCode; |
| this.letters[index] = String.fromCharCode(newCharCode); |
| return charCode; |
| } |
| |
| RandomTextGenerator.prototype.generate = function() { |
| var result = this.letters.join(""); |
| |
| var index = 0; |
| while (1) { |
| var charCode = this.advance(index); |
| if (charCode != RandomTextGenerator.lastCharCode) |
| break; |
| ++index; |
| } |
| |
| return result; |
| } |
| |
| var target = document.getElementById("target"); |
| var style = target.style; |
| var randomTextGenerator = new RandomTextGenerator; |
| |
| function test() { |
| var target = document.getElementById("target"); |
| var style = target.style; |
| |
| var innerHTML = "<p>"; |
| for (var i = 0; i < 5000; ++i) |
| innerHTML += randomTextGenerator.generate() + " "; |
| innerHTML += "</p>"; |
| target.innerHTML = innerHTML; |
| |
| style.display = "block"; |
| style.width = "280px"; |
| target.offsetLeft; |
| style.display = "none"; |
| } |
| |
| PerfTestRunner.measureRunsPerSecond({ run: test }); |
| </script> |
| </body> |
| </html> |
