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<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
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<body>
</body>
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console.log(0 == false); //true, 自動型轉成 0, == , 相依性: 從左至右, 所以會以左邊為主來轉
var a = 3 + 4 * 5; // * 運算子優先性比 + 還高(先乘除後加減)
console.log(a)
//當運算子優先性相同,就依據相依性來判斷是左到右執行還是右到左執行。
//現在有兩個 < 運算子,所以優先性是一樣的,那就再來看 < 的相依性:
//< 相依性為左到右,所以3 < 2 < 1 的執行順序是先比較3和2,再比較1。
//3 < 2相比結果是false,接著再運行false < 1的相比較。
//在JS中,true若被強制型轉成數值會是1,false被強制型轉成數值會是0。
//這裡的false因為與數值進行比較判斷,被JS自動型轉成0,變成0 < 1,而0 < 1成立,true
console.log(3 < 2 < 1); //true
Output
300px
You can jump to the latest bin by adding /latest
to your URL
Keyboard Shortcuts
Shortcut | Action |
---|---|
ctrl + [num] | Toggle nth panel |
ctrl + 0 | Close focused panel |
ctrl + enter | Re-render output. If console visible: run JS in console |
Ctrl + l | Clear the console |
ctrl + / | Toggle comment on selected lines |
ctrl + ] | Indents selected lines |
ctrl + [ | Unindents selected lines |
tab | Code complete & Emmet expand |
ctrl + shift + L | Beautify code in active panel |
ctrl + s | Save & lock current Bin from further changes |
ctrl + shift + s | Open the share options |
ctrl + y | Archive Bin |
Complete list of JS Bin shortcuts |
JS Bin URLs
URL | Action |
---|---|
/ | Show the full rendered output. This content will update in real time as it's updated from the /edit url. |
/edit | Edit the current bin |
/watch | Follow a Code Casting session |
/embed | Create an embeddable version of the bin |
/latest | Load the very latest bin (/latest goes in place of the revision) |
/[username]/last | View the last edited bin for this user |
/[username]/last/edit | Edit the last edited bin for this user |
/[username]/last/watch | Follow the Code Casting session for the latest bin for this user |
/quiet | Remove analytics and edit button from rendered output |
.js | Load only the JavaScript for a bin |
.css | Load only the CSS for a bin |
Except for username prefixed urls, the url may start with http://jsbin.com/abc and the url fragments can be added to the url to view it differently. |