<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <script> /* * splice(start, deleteCount, data1, data2, data3...) * */ var arr = ['a', 'b', 'c', 'd', 'e']; //1, 3 // [8,6,4] //['a',8,6,4] //arr.splice(-5); //console.log(arr); function arrSplice(data, start, deleteCount) { // 如果start不是數(shù)字，或不能轉(zhuǎn)成數(shù)字，start默認(rèn)就為0 if (isNaN(start)) { start = 0; } start = Number(start); // 如果start是負(fù)數(shù) if (start < 0) { start = data.length + start; } if (start < 0) { start = 0; } // 如果deleteCount沒傳 if (deleteCount == undefined) { deleteCount = data.length - start; } /* * 1. 準(zhǔn)備一個(gè)空的數(shù)組，用于存放最后的結(jié)果 * 2. 循環(huán)源數(shù)組 * 1. 得到當(dāng)前循環(huán)過程中的下標(biāo) * 2. 把這個(gè)下標(biāo)和start做比較 * 1. 如果當(dāng)前下標(biāo)小于start，則把當(dāng)前數(shù)組添加到新數(shù)組中 * 2. 否則 * 1. 是否有新增數(shù)據(jù) * 1. 如果有新在數(shù)據(jù)，則把新增數(shù)據(jù)添加到新數(shù)組中 * 2. 否則，如果deleteCount大于0，忽略這個(gè)數(shù)據(jù)，并對deleteCount-- * 否則，把當(dāng)前數(shù)據(jù)添加到新數(shù)組中 * */ var newArr = []; //新增數(shù)據(jù) var newData = []; if (arguments.length > 3) { for (var i=3; i<arguments.length; i++) { // newData.push(arguments[i]); newData[newData.length] = arguments[i]; } } for (var i=0; i<data.length; i++) { if (i < start) { // newArr.push(data[i]); newArr[newArr.length] = data[i]; } else { if (newData.length) { //有新增數(shù)據(jù)的 // newArr = newArr.concat(newData); for (var j=0; j<newData.length; j++) { newArr[newArr.length] = newData[j]; } newData.length = 0; } if (deleteCount > 0) { deleteCount--; } else { // newArr.push(data[i]); newArr[newArr.length] = data[i]; } } } data = newArr; console.log(data); } </script> </body> </html>
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