清除数组中的特定数值
题目:清除数组中的undefined
解决方案1:
var ccc = [1,2,3,undefined,undefined,undefined,undefined,4,5,6] for(var i = 0;i<ccc.length;i++){ if(typeof ccc[i] == "undefined"){ ccc.splice(i,1) } }
console.log(ccc)
解决方案2:
var ccc = [1,2,3,undefined,undefined,undefined,undefined,4,5,6]; var ddd = []; for(var i = 0;i<ccc.length;i++){ if(typeof ccc[i] !== "undefined"){ ddd.push(ccc[i]) } }
ccc = ddd;
console.log(ccc)
var ccc = [1,2,3,undefined,undefined,undefined,undefined,4,5,6] alert(ccc.length) for(var i = ccc.length;i>=0;i--){ if(typeof ccc[i] == "undefined"){ ccc.splice(i,1) } }
console.log(ccc)
解决方案5:
var ccc = [1,2,3,undefined,undefined,undefined,undefined,4,5,6]; ccc.toString().split(/,/)
console.log(ccc)
有木有发现问题哪个解决方案是不对的