HTML代码:
<p id="result"></p>
JS代码:
var eleResult = document.getElementById("result");
if (!window.console) {
window.console = {};
}
console.log = function(result) {
var text = document.createTextNode(result), br = document.createElement("br");
eleResult.appendChild(text);
eleResult.appendChild(br);
};
if (typeof Array.prototype.indexOf != "function") {
Array.prototype.indexOf = function (searchElement, fromIndex) {
var index = -1;
fromIndex = fromIndex * 1 || 0;
for (var k = 0, length = this.length; k < length; k++) {
if (k >= fromIndex && this[k] === searchElement) {
index = k;
break;
}
}
return index;
};
}
var data = [2, 5, 7, 3, 5];
console.log(data.indexOf(5, "x")); // 1
console.log(data.indexOf(5, "3")); // 4 (从3号位开始搜索)
console.log(data.indexOf(4)); // -1 (未找到)
console.log(data.indexOf("5")); // -1 (未找到,因为5 !== "5")