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console

            
let _this = null
var app = new Vue({
    el: '#app',
    data: {
        filter: [],
        entries: [],
        insertForm: {
            marketName: null,
            marketValue: 0
        }
    },
    created() {
        _this = this
        _this.initMethods()
    },
    methods: {
        initMethods() {
            // 筛选
            const arr = ['a', 'b', 'c', 'd']
            _this.filter = arr.filter(v => (v === 'a' || v === 'b'))
            var fruits = ["Banana", "Orange", "Apple", "Mango"];
            fruits.entries();
            console.log(fruits.entries())
        },
    }
})

            
<!DOCTYPE html>
<html>
<head>

  <meta charset="utf-8">
  <title>文档标题</title>
</head>
<body>
<div id="app">
    <h1>js</h1>
    <p>数组</p>
    <p>// 筛选</p>
    <span>filter:{{filter}}</span>
     <p>// 迭代</p>
    <span>entries:{{entries}}</span>
</div>
</body>
</html>