判断相应式布局中当前适配度的JavaScript代码

function isBreakPoint(bp) {  // The breakpoints that you set in your css
  var bps = [320, 480, 768, 1024];  var w = $(window).width();  var min, max;  for (var i = 0, l = bps.length; i < l; i++) {    if (bps[i] === bp) {
      min = bps[i-1] || 0;
      max = bps[i];      break;
    }
  }  return w > min && w <= max;
}

if ( isBreakPoint(320) ) {  // breakpoint at 320 or less}if ( isBreakPoint(480) ) {  // breakpoint between 320 and 480}
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