求数组最小值:
var arr = [3,43,23,45,65,90];
Array.prototype.min = function() {
var min = this[0];
var len = this.length;
for(var i = 0;i< len;i++){
if(this[i] < min){
min = this[i];
}
}
return min;
}
var min = arr.min();
console.log(min); // 3
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