方法说明：
该方法和 assert.ok() 相同。如果 表达式(expression)求值结果是false将会抛出一个 AssertionError 伴随着提示信息（message）
语法：
console.assert(expression, [message])
接收参数：
expression 表达式
message 错误提示信息
例子：
var a = 0;
console.assert(a == 1, 'error!');
源码：
Console.prototype.assert = function(expression) {
if (!expression) {
var arr = Array.prototype.slice.call(arguments, 1);
require('assert').ok(false, util.format.apply(this, arr));
}
};
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