我的JavaScript的性能富:遗漏的类型错误:无法读取未定义
todo.completed = !todo.completed;
错误:
Uncaught TypeError: Cannot read property 'completed' of undefined
at Object.toggleCompleted (script.js:34)
at Object.toggleCompleted (script.js:89)
at HTMLButtonElement.onclick ((index):33)
toggleCompleted @ script.js:34
toggleCompleted @ script.js:89
onclick @ (index):33
这里我错过什么?
更换
<script src = "filename.js></script>
你宣布'todo',比如'VAR待办事项= {}' –的错误是非常自我解释。那又怎样让你困惑? – Taplar