1. for 循环版

Element.prototype.hasChildren = function () {const childNodes = this.childNodes,len = childNodes.length;for (let i = 0; i < len; i++) {const item = childNodes[i];if (item.nodeType === 1) {return true;}}return false;
}

2. while 循环版

Element.prototype.hasChildren = function () {const childNodes = this.childNodes,len = childNodes.length;while (len) {item = childNodes[len - 1]; // 倒着遍历if (item.nodeType === 1) {return true;}len--;}return false;
}