Created
August 24, 2015 17:55
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| /* | |
| // local | |
| var separator = "| |"; | |
| // global | |
| separator = "| |"; | |
| // string concat | |
| message = "one" + separator + "two"; | |
| // puts | |
| console.log(message); | |
| */ | |
| // console.log(multiply(5, 6)); | |
| // declare before everything else | |
| // function multiply(a, b) { | |
| // declare at a specific time | |
| var multiply = function(a, b) { | |
| if(a == undefined || b == undefined) { | |
| console.log("At least two arguments needed"); | |
| } else { | |
| console.log(a, b); | |
| return a * b; | |
| } | |
| } | |
| // each(array, function(element) { // do something }); | |
| var each = function(array, operator) { | |
| for(var i=0; i<array.length; i++) { | |
| operator(array[i]); | |
| } | |
| } | |
| each([345, 213, 687, 33, 1], function(elem) { | |
| var multiplier = 10; | |
| var times_ten = function(e) { | |
| return e * multiplier; | |
| } | |
| console.log(times_ten(elem)); | |
| }); | |
| var count = 0; | |
| while(count < 10) { | |
| setTimeout(function() { | |
| console.log("hello world once again"); | |
| }, 500 * count); | |
| count += 1; | |
| } | |
| var task = function(delay) { | |
| setTimeout(function() { | |
| console.log("half a second!"); | |
| task(delay); | |
| }, delay); | |
| } | |
| task(500); | |
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| <html> | |
| <head> | |
| <title>intro to JS</title> | |
| <style> | |
| body { margin: 0; padding: 50px; font-family: monospace; } | |
| .dot { width: 30px; height: 30px; margin: -15px; background: #000; border-radius: 50%; position: absolute; } | |
| </style> | |
| </head> | |
| <body> | |
| <h1 id="title">weeeee</h1> | |
| <script> | |
| var randomColor = function() { | |
| return '#'+Math.floor(Math.random()*16777215).toString(16); | |
| } | |
| document.addEventListener("mousemove", function(e) { | |
| var dot = document.createElement("div"); | |
| dot.className = "dot"; | |
| dot.style.top = e.pageY + "px"; | |
| dot.style.left = e.pageX + "px"; | |
| dot.style.backgroundColor = randomColor(); | |
| document.body.appendChild(dot); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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