| var str = ' hello ' |
| console.log(str.trim()) |
| var str1 = ' he l l o ' |
| console.log(str.trim()) |
| <!DOCTYPE html> |
| <html lang="en"> |
| |
| <head> |
| <meta charset="UTF-8"> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> |
| <title>Document</title> |
| </head> |
| |
| <body> |
| <input type="text"> <button>点击</button> |
| <div></div> |
| <script> |
| |
| var str = ' an dy '; |
| console.log(str); |
| var str1 = str.trim(); |
| console.log(str1); |
| var input = document.querySelector('input'); |
| var btn = document.querySelector('button'); |
| var div = document.querySelector('div'); |
| btn.onclick = function() { |
| var str = input.value.trim(); |
| if (str === '') { |
| alert('请输入内容'); |
| } else { |
| console.log(str); |
| console.log(str.length); |
| div.innerHTML = str; |
| } |
| } |
| </script> |
| </body> |
| |
| </html> |
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