【JS学习笔记】内置对象

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//Global对象//URI编码var name = "//qiu 邱"var encodeName = encodeURI(name);var encodecompName = encodeURI(name);document.write(encodeURI(name) +'<br>');document.write(encodeURIComponent(name) +'<br>');document.write(decodeURI(encodeName));document.write(decodeURIComponent(encodeName));//eval()方法//担当一个字符串解析器的作用（常配合数据库使用）eval('var box = 100');document.write(box);//Math对象Math.E;Math.LN10;Math.LN2;Math.LOG2E;Math.LOG10E;Math.PI;Math.SQRT1_2;Math.SQRT2;Math.min(2,3);//最小值Math.max(2,3);//最大值Math.ceil(25.1);//26：向上舍入Math.floor(25.9);//25：向下舍入Math.round(25.5);//26：四舍五入//random()：产生随机数//参数lower 到 upper的随机数function selectForm(lower, upper){var number = upper - lower + 1;return Math.floor(Math.random()*number + lower); }