两个数组的内容是否相同

// 两个数组的内容是否相同 a.equals(b);
if (Array.prototype.equals)
console.warn(“Overriding existing Array.prototype.equals. Possible causes: New API defines the method, there’s a framework conflict or you’ve got double inclusions in your code.”);
// attach the .equals method to Array’s prototype to call it on any array
Array.prototype.equals = function (array) {
// if the other array is a falsy value, return
if (!array)
return false;

// compare lengths - can save a lot of time 
if (this.length != array.length)
    return false;

for (var i = 0, l = this.length; i < l; i++) {
    // Check if we have nested arrays
    if (this[i] instanceof Array && array[i] instanceof Array) {
        // recurse into the nested arrays
        if (!this[i].equals(array[i]))
            return false;
    }
    else if (this[i] !== array[i]) {
        // Warning - two different object instances will never be equal: {x:20} != {x:20}
        return false;
    }
}
return true;

}
// Hide method from for-in loops
Object.defineProperty(Array.prototype, “equals”, { enumerable: false });