qq_30091939的博客

函数检查字符串是否是目标字符开始的/** * Checks if `string` starts with the given target string. */function startsWith(string, target, position) { const { length } = string position = position == null ? 0 : ...

function filter(array, predicate) {let index = -1let resIndex = 0const length = array == null ? 0 : array.lengthconst result = []while (++index < length) {const value = array[index]if (predi...

我们通过例子来分析源码和两个方法之间的区别举例：_.forEach()var array = [1,2,3,4,5]; var res = _.forEach(array, function (item,index,input) { input[index] = item*10; }) console.log(res);//=&gt;undefinedcon...