// 手写简易版的es6中数组的includes方法
Array.prototype.includes = function (item, index) {
var arr = this;
var flag = false;
if (!arguments[0] || !arguments[1]) return false;
for (let i = 0; i < arr.length; i++) {
if (!!index) {
if ((typeof index == 'string' || typeof index == 'number') && (arr[i] == item && i == index)) {
flag = true;
break;
}
} else {
if (arr[i] == item) {
flag = true;
break;
}
}
}
return flag;
}
// 手写new函数的实现
function _new(Fn, ...args) {
var obj = Object.create(Fn.prototype);
// obj.__proto = Fn.prototype;
var result = Fn.call(obj, ...args);
return result != null && (typeof result == 'object' || typeof result == 'function') ? result : obj;
}
手写一些方法实现 大神勿喷
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转载自blog.csdn.net/oQieBaoChaYinZuo/article/details/107378318
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