Array.from Array.of Array.isArray Array.fill 改变数组长度 ❌ // fill 填充 arr.fill(value[, start[, end]]) 1. 2. Array.splice 改变数组长度 ❌ // splice 拼接 let arrDeletedItems = array.splice(start[, deleteCount[, item1[, item2[, ...]]]) 1. 2. Array.slice 不...
Array([jpg_jpg] => Array ( [name] => jpg.jpg [type] => image/jpeg [tmp_name] => D:\xampp\tmp\phpA595.tmp [error] => 0 [size] => 133363 )[png_png] => Array ( [name] => png.png [type] => image/png [t...
get(target, property, receiver) { onChangeFunction(); const value = Reflect.get(target, property, receiver); if (typeof value === 'object') { return new Proxy(value, handler); } return value;} 这样 onChange 便可观察 array 与 object 的变化。是不是对 proxy 认知更清晰了呢？...
1//js 数据类型共6种(es5) number,string,boolean,null,undefined,引用数据类型(Array,Object,Function)2//Symbol (ES6 新增,表示独一无二的值)3vartypeArr =[4{5type: '数值类型',6value: 2517},8{9type: '字符串类型',10value: 'abcdefg'11},12{13type: '布尔类型',14value:false15},16{17type:...
array;//[1, 2, 3, 4, 5, 6] unshift():向数组的开头添加元素,返回时原数组的个数(直接在原数组上添加) vararray = [1,2,3,4]; array.unshift(2);//返回数组长度5 array;//[ 2, 1, 2, 3, 4] splice():将一个或多个新元素插入到数组的指定位置,插入位置的元素删除或自动后移,返回空或...
在.js 文件中定义 eventHandler 并更新数据 Page({data: {array: ['北京大学','清华大学','浙江大学'],index:''},bindPickerChange:function(e) {console.log('picker发送选择改变,携带值为', e.detail.value)this.setData({index: e.detail.value}); ...
Change caseexports asplitutility which can be used to build other case functions. It accepts a string and returns each "word" as an array. For example: split("fooBar").map((x)=>x.toLowerCase()).join("_");//=> "foo_bar"
multiple:是否可以选择多个文件,多个文件时其value值为第一个文件的虚拟路径。 1、accept 只能选择png和gif图片 2、multiple 多文件上传 3、常用MIME类型后缀名 MIME名称 *.3gpp audio/3gpp, video/3gpp *.ac3 audio/ac3 *.asf allpication/vnd.ms-asf *.au audio/basic *.css text/css *.csv text/csv...
Returns an array of errors. If your validate function returns a non-boolean value, it is added here as the validation property. [ { key: "firstName", value: "Jim", validation: "First name must be greater than 7 characters", }, { key: "address.zipCode", value: "123", validation: ...
<!DOCTYPE html> Title 请选择 {{province.text}} 请选择 {{city.text}} new