vue.js中報錯: TypeError: Cannot read property 'indexOf' of undefined
阿新 • • 發佈:2019-01-04
[Vue warn]: Error when evaluating expression "name.indexOf('jack') >= 0": TypeError: Cannot read property 'indexOf' of undefined
ypeError: Cannot read property 'indexOf' of undefined,從這句話中indexOf()是一個函式,但是卻不能識別該屬性,說明引用物件出錯。
程式碼如下所示:
<!doctype html>
<!DOCTYPE html>
<html>
<head>
<title>dd</title>
</head>
<body>
<!-- view -->
<div id="app">
<h1 v-if="yes">yes</h1>
<h1 v-if="no">no</h1>
<h1 v-if="age>=25">Age:{{age}}</h1>
<h1 v-if="name.indexOf('jack') >= 0" >Name:{{name}}</h1>
</div>
</body>
<script type="text/javascript" src="vue.js"></script>
<script type="text/javascript">
// viewModel
var vm = new Vue({
el:"#app",
data:{
yes:true,
no:false,
age:27,
naem:"jack"
}
})
</script>
</html>
從上面程式碼看出,data的屬性“naem”和view中的“name”不一樣
總結:ypeError: Cannot read property 'indexOf' of undefined,一般情況是引用物件屬性出錯