Js之如何移除Array/数组中指定元素

var array = [0,1,2,3,4,5];
var index = array.indexOf(5);

if (index > -1) {
    array.splice(index, 1);
}

var colors = ["red", "blue", "grey"];   //创建一个包含3个字符串的数组
colors.length = 2;
console.log(colors[2]);  //undefined

var arr = [1, 2, 3, 4];
delete arr[0];
console.log(arr);   //[undefined, 2, 3, 4]

var colors = ["red", "blue", "grey"];
var item = colors.pop();
console.log(item);      //"grey"
console.log(colors.length);    //2

var colors = ["red", "blue", "grey"];
var item = colors.shift();
console.log(item);      //"red"
console.log(colors.length);    //2

var colors = ["red", "blue", "grey"];
var item = colors.splice(0, 1);
console.log(item);      //"red"
console.log(colors);    //["blue", "grey"]

var colors = ["red", "blue", "grey"];
colors.forEach(function(item, index, arr) {
    if(item == "red") {
        arr.splice(index, 1);
    }
});

var colors = ["red", "blue", "grey"];
colors = colors.filter(function(item) {
    return item != "red"
});
console.log(colors);    //["blue", "grey"]

Array.prototype.remove = function(dx) {
    if(isNaN(dx) || dx > this.length){
        return false;
    }
    for(var i = 0,n = 0;i < this.length; i++) {
        if(this[i] != this[dx]) {
            this[n++] = this[i];
        }
    }
    this.length -= 1;
};
var colors = ["red", "blue", "grey"];
colors.remove(1);
console.log(colors);    //["red", "grey"]