一、bind函数
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>bind</title>
</head>
<body>
<script>
function _bind (fn, obj){
obj.fn = fn
return function (...args){
obj.fn(...args)
delete obj.fn
}
}
var obj = {
name: 'xinxin'
}
function test (){
console.log(this.name)
console.log(arguments)
}
var b = _bind(test, obj);
b(20, 'man')
</script>
</body>
</html>二、call函数实现
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
Function.prototype._call = function (obj, ...args) {
obj.fn = this;
obj.fn(...args)
delete obj.fn
}
function test() {
console.log(this.name)
console.log(arguments)
}
var obj = {
name: 'xinxin'
}
test._call(obj, 1, 2, 3, 4)
</script>
</body>
</html>三、对象深拷贝
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
function deep(val){
if (typeof val == 'object' ){
let res = Array.isArray(val) ? [] : {};
for (let key in val){
if (typeof val[key] == 'object'){
res[key] = deep(val[key])
} else {
res[key] = val[key]
}
}
return res
} else {
throw new Error('不是可靠对象');
}
}
var a = 11
b = deep(a)
console.log(b)
</script>
</body>
</html>四、Object.create实现
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
function create (obj){
function a (){}
a.prototype = obj
return new a()
}
var obj = {
name: 'xinxin',
say:function (){
console.log(this.name)
}
}
var b = create(obj)
console.log(b.say())
</script>
</body>
</html>五、双向绑定的实现
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input type="text" id="input">
<span id="span"></span>
<script>
var _input = document.getElementById('input')
var _span = document.getElementById('span')
var obj = {
text: ''
}
Object.defineProperty(obj, 'text', {
configurable: true,
enumerable: true,
get() {
console.log('获取数据了')
},
set(newVal) {
console.log('数据更新了')
_input.value = newVal
_span.innerHTML = newVal
}
})
_input.addEventListener('keyup', function (e){
obj.text = e.target.value
})
obj.text = '111'
</script>
</body>
</html>六、settimeout实现setinterval
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
function shixian() {
console.log(1)
setTimeout(function () {
shixian()
}, 2000)
}
shixian()
</script>
</body>
</html>标签： JavaScript
