js 数组操作和数字字符串操作相关累积

判断是否是数组可以用 Array.isArray 来判断，示例：

var arr = [1,2];

if(Array.isArray(arr))  {
    console.log("是数组");
}else{
    console.log("不是数组");
}

数组删除元素
var arr = ['dog','pig'];
arr.splice(index,1);

两个数组去重

delArr(arr1,arr2){
    var newArr = [];
    console.log(arr1,arr2);
    for(var i in arr1){
        console.log(arr2.indexOf(parseInt(arr1[i])),arr2.indexOf(arr1[i]));
        if (arr2.indexOf(parseInt(arr1[i])) < 0 && arr2.indexOf(arr1[i]) < 0) {
            newArr.push(arr1[i]);
        }
    }
    console.log("newArr",newArr);
    return newArr;
}

对象删除元素
var arr = {
   a:'dog',b:'pig'
};

delete checkeddata['a'];