vue.delete()
删除对象属性
通过delete操作符, 可以实现对对象属性的删除操作, 返回值是布尔
例： var obj={name: 'zhagnsan',age: 19 }
delete obj.name //true
typeof obj.name //undefined
同样可用于函数，数组，变量，对象，但对象不能删除，只能做到删除对象属性
删除变量
例： var name ='zs' //已声明的变量
delete name //false
console.log(typeof name) //String
age = 19 //未声明的变量
delete age //true
typeof age //undefined
this.val = 'fds' //window下的变量
delete this.val //true
console.log(typeof this.val) //undefined
删除数组
以声明数组返回false，未声明返回true
var arr = ['1','2','3'] ///已声明的数组
delete arr //false
console.log(typeof arr) //object
arr = ['1','2','3'] //未声明的数组
delete arr //true
console.log(typeof arr) //undefined
var arr = ['1','2','3'] //已声明的数组
delete arr[1] //true
console.log(arr) //['1','empty','3']
删除函数
var fn = function(){} //已声明的函数
delete fn //false
console.log(typeof fn) //function
fn = function(){} //未声明的函数
delete fn //true
console.log(typeof fn) //undefined
删除对象
var person = {
height: 180,
long: 180,
weight: 180,
hobby: {
ball: 'good',
music: 'nice'
}
}
delete person ///false
console.log(typeof person) //object
var person = {
height: 180,
long: 180,
weight: 180,
hobby: {
ball: 'good',
music: 'nice'
}
}
delete person.hobby ///true
console.log(typeof person.hobby) //undefined
<div class="div-info" testAttr="myAttr" testAttr2="haha"></div>
1、js中设置自定义属性。
例如：$(".div-info").attr("testAttr3","houhou")
结果：给div设置了新的自定义属性testAttr3，值为houhou
<div class="div-info" testAttr="myAttr" testAttr2="haha" testAttr3="houhou">
</div>
2、js中获取自定义属性值。
例如：$(".div-info").attr("testAttr")
结果：取到testAttr的值为：myAttr
3、js中修改自定义属性值。
例如：$(".div-info").attr("testAttr","newAttr")
结果：将testAttr的值修改为newAttr
<div class="div-info" testAttr="newAttr" testAttr2="haha">
</div>
4、js中删除自定义属性
来自参考！
